Laravel + Vue「フォロー中」のボタンがページを再読み込みをすると「フォローする」に戻ってしまう

フォロー機能は正常に動いていますが、フォロー中のユーザーにも関わらずボタンの表示が変化してしまう状況です。

###UserDetail.vue

<template>
  <div v-if="user" class="tweet-detail">
    <nav class="panel panel-default">
      <div class="list-group">
        <img src="" alt="icon" class="img-circle">
        <div class="list-group-item">
          <span>
            {{ user.name }}さん
          </span>
        </div>
        <div v-if="user.id == userid">
          <RouterLink
            class="tweet__overlay"
            :to="`/users/${user.id}/edit`"
          >
            <div class="list-group-item">
              <span>
                編集
              </span>
            </div>
          </RouterLink>
        </div>
        <!-- フォロー機能 -->
        <div v-if="user.id != userid" class="follow">
          <button v-if="currentFollowing" type="button" class="btn btn-point btn-raised" @click="unfollow">
            <div v-if="sending" class="spinner-border spinner-border-sm" role="status">
              <span class="sr-only">Sending...</span>
            </div>
            <div v-else>フォロー中</div>
          </button>
          <button v-else type="button" class="btn btn-default btn-raised" @click="follow">
            <div v-if="sending" class="spinner-border spinner-border-sm" role="status">
              <span class="sr-only">Sending...</span>
            </div>
            <div v-else>
              フォローする
            </div>
          </button>
        </div>
      </div>
    </nav>
    <div class="tweet-list">
      <div class="grid">
        <UserTweet
          class="grid__item"
          v-for="tweet in user.tweets"
          :key="tweet.id"
          :item="tweet"
        />
      </div>
    </div>
  </div>
</template>

<script>
import { OK } from '../util'
import UserTweet from '../components/UserTweet.vue'

export default {
  components: {
    UserTweet,
  },
  props: {
    id: {
      type: String,
      required: true
    },
    following: {
      type: Boolean,
      default: false
    },
  },
  data () {
    return {
      user: null,
      currentFollowing: this.following,
      sending: false
    }
  },
  methods: {
    async fetchUser () {
      const response = await axios.get(`/api/users/${this.id}`)

      if (response.status !== OK) {
        this.$store.commit('error/setCode', response.status)
        return false
      }

      this.user = response.data
      this.user.tweets = response.data.tweets
      this.user.followCount = response.data.followCount
    },
    async follow() {
      if (this.sending) {
        return
      }
      this.sending = true
      const data = { id: this.id }
      await axios.post('/api/follow-users', data)
      this.currentFollowing = true
      this.sending = false
    },
    async unfollow() {
      if (this.sending) {
        return
      }
      this.sending = true
      await axios.delete(`/api/follow-users/${this.id}`)
      this.currentFollowing = false
      this.sending = false
    }
  },
  watch: {
    $route: {
      async handler () {
        await this.fetchUser()
      },
      immediate: true
    }
  },
  computed: {
    userid () {
      return this.$store.getters['auth/userid']
    }
  }
}
</script>

<style>
  .follow {
    margin: 5px;
  }
</style>

###User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * リレーションシップ - tweetsテーブル
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function tweets()
    {
        return $this->hasMany('App\Tweet');
    }

    public function followUsers()
    {
        return $this->belongsToMany(self::class, 'follow_users', 'user_id', 'followed_user_id')
            ->using(FollowUser::class);
    }


    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password', 'tweets', 'followCount'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'email_verified_at', 'password', 'remember_token',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    protected $visible = [
        'id', 'name', 'email', 'tweets'
    ];

}

###FollowUser.php

<?php

namespace App;

// use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\Pivot;

class FollowUser extends Pivot
{
    protected $table = 'follow_users';
    public $timestamps = false;
    protected $guarded = [];
}

###UserController.php

<?php

namespace App\Http\Controllers;

use App\FollowUser;
use App\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class UserController extends Controller
{
    public function __construct()
    {
        // 認証が必要
        $this->middleware('auth')->except(['show']);
    }

    /**
     * user詳細
     * @param string $id
     * @return User
     */
    public function show(string $id)
    {
        $user = User::where('id', $id)->with(['tweets'],['followCount'])->first();

        return $user ?? abort(404);
    }

    /**
     * user編集
     * @param string $id
     * @return User
     */
    public function edit(string $id)
    {
        $user = User::where('id', $id)->first();

        return $user ?? abort(404);
    }

    /**
     * user保存
     * @param Request $request
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request)
    {
        $user = Auth::user();
        $user->email = $request->email;
        $user->name = $request->name;
        $user->save();
        return response($user, 201);
    }
    
}

###FollowUserController.php

<?php

namespace App\Http\Controllers;

use App\FollowUser;
use App\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class FollowUserController extends Controller
{
    public function __construct()
    {
        // 認証が必要
        $this->middleware('auth');
    }

    // フォロー
    public function store(Request $request)
    {
        // $followedUser = User::where('id', $request->id)->first();
        $followedUser = User::findOrFail($request->input('id'));
        FollowUser::firstOrCreate([
            'user_id' => Auth::id(),
            'followed_user_id' => $followedUser->id,
        ]);
        // FollowUser::Create([
        //     'user_id' => Auth::user()->id,
        //     'followed_user_id' => $followedUser->id,
        // ]);
        return response()->json(['result' => true]);
    }

    // フォロー解除
    public function destroy($id)
    {
        // $followedUser = User::find($id);
        $followedUser = User::findOrFail($id);
        $user = Auth::user();
        $user->followUsers()->detach($followedUser->id);
        return response()->json(['result' => true]);
    }
}