Should I continue to support him if he doesn't do the same for me, in the way that I want him to?

Well my boyfriend's been going through some heavy things and so have I. Just the other day we got into a big argument, because he felt like I wasn't there for him ... Though, I told him countless times that I would be there any time he needed. But, I was going through some things that day in which I hadn't called him or txted him to check up on him. And, he basically just put the blame on me for not being there, and he really didn't bother to ask me what was going on. He asked me at first, but I didn't want to talk about that because I wanted to let him know that I was all ears for him. And ever since he's been going through these things, I call, txt him words of encouragemet. But, I barely recieve the same things in return. I told him how I felt about him not contacting me to check up on me, but he just jumped down my throat and said how dare I even say some things like that to him, because he feels that he's always there for me. What should I do?