(checks on my main character) he doesn't have his best friend or someone who is close to him and reciprocate the feeling! At least not for now.
I also personally don't believe in the concept of that ultimate "Best friend," especially for life. One of the background story of my main character is the harsh falling out with a person he considered to be his best friend.
I try to make close friend of characters rather of how they find comfort in each others rather than interest, understanding someone else doesn't need to be doing what they do. In another way, that interest might be something not commonly shared so they have to stick together.
The type of friendship in my series ranges from two people who eat out regularly to some gamer buddies plotting to steal corpses. For the former it's because they genuinely understand each other's hidden struggle and decide to do things together to dampen it, for the latter it's just two individuals with brain damage mingling with each others.