当if预期运行时正在执行的else语句

我的网站上有一个功能，互为好友的用户可以查看彼此的照片。例如，如果我以Conor的身份登录，并且我想查看Alice's的照片，Conor必须与Alice成为朋友，Alice必须与Conor成为朋友——他们必须是共同的朋友。

我的数据库中有一个名为favourites的表，它存储所有好友请求。假设favourites有两行：

   id: 1
   favourited_who: Alice
   favourited_by: Conor
   id: 2
   favourited_who: Conor
   favourited_by: Alice

他们彼此都有CCD_ 5。

考虑以下片段：

<?php
$get_favs_q = mysqli_query ($connect, "SELECT * FROM favourites");
        $getting_favs = mysqli_fetch_assoc($get_favs_q);
            $user_favourited = $getting_favs['favourited_who'];
            $user_favourited_by = $getting_favs['favourited_by'];
        /*************************/     
        if ($user == $username  || $user_favourited == $user && $user_favourited_by == $username 
                                || $user_favourited == $username && $user_favourited_by == $user){
            // $user = name in the URL after ?= - As we are on Alice's page .. $user equals Alice
            // $username = session variable for logged in user - $username = Conor
            // If both users have each other favourited, then the code to display images appears here.
        } else {
            echo "  <span style='margin-left: 10px;'> 
                        You and $ufirstname must favourite each other to view each others backstage. 
                    </span>";
        }
?>

我已经介绍了所有的场景，以检查$user是否有利于$username，反之亦然，但是，else语句总是在执行，从而呼应消息，我不明白为什么。