My best friend may have feelings for me, and it could be hurting our friendship...

I have a straight best friend (let's call him Shawn) whom I am absolutely attached to. However, recently he started making comments about the fact that he was afraid we were getting a little too close. He acknowledges me as his best and only true friend, and I have been a conduit through which he has been learning to express himself and open up (he's very closed off and doesn't share his feelings easily).About a week after the aforementioned conversation, which involved him revealing that even his mother warned him about getting too close to me because I was gay, we got into a fight over something incredibly trivial. He seemed to react very strongly and cut me out of his life.I immediately tried to make things right. I apologized. I attempted to get him to meet me so we could work through this. He refused.He said he couldn't trust me anymore, but hoped that he could trust me again someday so that we could return to being friends. His reaction was so unlike him. He was angry and brash, yelling at me for hurting him and for making it impossible for him to be emotionally open. The several reasons he gave for his anger were pure projection... Everything he mentioned was something that he is guilty of, rather than me (but believe me, I have no shortage of fault in this situation).Since then, Shawn hasn't spoken to me. This was 9 days ago. I heard from his roommate that he hasn't left his room since, and the pizza boxes are stacking up outside his door. Shawn seems depressed.When his roommate and I spoke about what happened, the roommate revealed to me that he thinks Shawn has feelings for me, but is struggling with it because he can't accept the idea of being gay. Despite his acceptance of me, he wasn't ready to face that he might also be gay.Through our mutual friend Allen (who reached out on my behalf), I've heard that Shawn said that he still wants to be my friend, but he "doesn't understand why". He told my friend Allen how incredibly hurt he is, and that he may consider talking to me again in a week or two. He said that he wants to be "numb" when he faces me.It's already been nine days. Now I have another week or two ahead of me, at a minimum, and have started giving him space since he won't respond to my messages (though he is reading them).I want to approach this the right way if/when he does speak to me... I want to be there for him, and help him through this. If he's actually having feelings for me, I want him to feel safe expressing that to me, and discovering who he is alongside me. Do I have feelings for him? Absolutely. I just never wanted to let that get in the way of our friendship. Now it might be a new defining factor of it... If it survives.No matter how he feels, I just want my best friend back, and I want him to be okay. I want him to be happy.How do I be supportive without being overreaching if he decides to talk to me about this? If it's even true at all, that is.I'll take any advice I can get. Thanks, everyone.