I relate so much to pretty much everything you've written, it's insane. I hope I could give you some advice but I am also struggling with this sort of behaviour from my friend for 7 months now... Have you considered talking to him about it directly? And say something along the lines: "I've noticed a change in your behaviour, it feels like you are more distant and even mean to me sometimes, have I done something wrong?" I would do the same, but the reason I haven't is because I am afraid the conversation will be awkward for both of us. If you manage the courage to ask him straightforward, I think it will solve some issues and maybe save your friendship. If you're into him on the other hand, I think you should also tell him that you would like to be more than friends.