Based on some of your comments, it seems like this is a repetitive pattern from you, where you focus more on your problems and forget about him. This is OK, but you have to put yourself in the shoes of others. This is the time where he really needs you, and was expecting you to be there for him instead the other way around. He's probably fed up.

I had a friend like that once. Every problem of hers had to be discussed in detail, but when I had a problem that I wanted to talk about, she would simply dismiss it. While I put up with it for a while, I just ended the relationship one time when I really needed her and she wasn't there for me.

If he means a lot to you, talk to him, but don't expect him to forgive you. Being let down by someone you care about is not easy to overcome.