<human>: Can you summarize the given text in a few sentences?

So, to give you the context of things, this is a long relationship and we kind of became best friends from the start.

I developed feelings for him and kept them bottled up because he was dating a common friend of us. This eventually came up and we gave it a try but after a while he decided that he wanted to go back to our friend and he did. It was really obvious of who he really liked from the start, but I wanted it so much that I didn't even care. To me this was an issue that was never really settled but I got back to the bottling phase and we went back to being best friends. Best friends who talk all the time and all that stuff. 

The thing is, for some time now, I don't really know where we're going. He blames me for everything, and makes a big deal out of EVERYTHING. Any little thing that happens and that he doesn't like, is my fault. Things like, another mutual friend of ours decides to go out or something like this and didn't tell us, he finds out and it's my fault because we're leaving him aside. And it wasn't even me doing this. And the list goes on. Basically he got so involved with his SO that I'm the bridge between him and our others friends. And he always blames me for every little thing that doesn't pleases him. (and oh boy, there are many).

This is the kind of relationship where I can be as mad as hell and I end up being the one taking the fall and saying sorry.
I realize that I still hold the feelings for him and that it interferes with how I handle things, but it never stopped me from treating him well, and always being there. I have put up with so much shit in our relationship, and I've always been there. Every time he goes like this, I go and get him. Every. time.

Recently, over one more of those stupid things, he went ballistic and told me he needed to get away of the drama (that he makes, but he forgot this part) and that he wasn't going to speak with me for a while. Should I go after him, like I did so many times?

Ages: ~25 everyone involved
<bot>: Best friend for whom I have long time feelings is dating another friend and is treating me like shit in every possible situation and now decides he doesn't want to talk with me anymore.