Not coming home tonight!

So I received a text, that my bf is not coming home tonight and just to be fair, he wants us to be on the same page so when "things" happen I won't be shocked. I texted what "things" and he texted now you want to be concerned. I am at a loss for words. I don't know where he is, where he will be tonight or even who he is with???? Talk about feeling like I've just killed my relationship. He said the only solution to the problem is he is going to start looking out for just him and now it's my turn to be treated bad. I am aware that this is my fault that I have treated him badly, but do two wrongs make a right? I am worried sick, wondering what the hell is going on? I feel like getting dressed and going out, but then I feel like why should I, this is not a game this is our relationship or what is left of our relationship. It's been over 2.5 years we have been together and I am at the point where he doesn't deserve the constant bullshit I put him through. But what confuses me is that I don't set out to exclude him, or hurt him or make him feel like I don't care about him, so how is it that sometimes my actions just turned out that way. What are the deeper issues here? WTF is he doing right now?