<human>: Before you read this it is worth me mentioning I have some sort of mental issue. I have not been diagnosed with anything but I take antidepressants and something for mood swings. So I might be bipolar. Worth mentioning in case I come off as extreme. 

Recently my best friend, John, has been going through a small crisis. He dislikes all of my friends because they're not great people. Understandable I guess. 

He is upset because he let himself gain too much weight, he feels like he isn't as good of a student as he can be and that he wastes a lot of time. He said the other day he is going to go away, mentally. I have no idea what that means and I can't get him to elaborate. 

I feel like I am holding him back. He hasn't said anything of the sort but I feel like he's afraid to say anything to me because I can take things really poorly. 

I'm John's only friend. And I feel like I'm a shit friend at that. It might be crazy, but with the way he has been the past few months I don't know. 

Our interests are  becoming more and more different. This usually results in pretty poor conversations now when we text. He will type a two or three long message about something I don't know about or like very much so I can only text back one or two sentences. I feel bad but I often tell him I don't know what to say about that stuff. 

He could be tired of me. We had a class this semester and would turn spend about an hour everyday talking. He hasn't said anything about it though so I don't know. 

Should I ask him if he wants to take a break or something? He's my closest friend and of he needs to stop being friends to do better then I will do whatever I can to help him even if it means not being his friend. 

I'm probably just being me about this, but I don't know. I want to help him but I don't know if I can or what that entails.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Best friend is having a crisis right now and retooling his life and cutting out bad things. I think I might be a bad thing and he is too afraid to tell me.