Please help Totally confused

I have been dating this guy for about 6 months now, and things were going good. We dated for a short while about 8 years ago, but I broke it off because I want whole heartily into it. We talked to each other a few times over the years, but nothing on a serious note. Anyway we started going out again 6 months ago, and have a lot in common. We’ve traveled together and even when we argue we still enjoy each others company. About 3 weeks ago, we had a major fall out, because we were supposed to go somewhere together, and he never showed up. I kept calling and he ignored my calls. He calls me early the next morning to apologize and to say that he had sometime of drama with his child’s mother and was unable to make it. I told him that was no excuse and that he should have called and said something. He know I hate waiting. we separated, and last week he tried making back up. we talked about what he did and i told him that it was totaly disrespectful what he did, and that he hurt me deeply. He apologized and promised that it wouldn’t happen again. We agreed to give it one more try and he invited me to come over that night for dinner. I waited for his call, and when he didn’t call, I text him and called him. He didn’t answer any of my calls, nor returned my text. Finally after 11 he answered and said he fell asleep. By this time I was @ his house and he told me that showing up there was phycotic, we got into a big argument again and I said it was over. My question is why would he do that? We just spoke about how i felt when he did it the first time, and less than 24 hours he’s doing the same thing. If he didn’t want the relationship why not let it go, why persuade me to give it another go, only to mess things up the same day. He refuses to answer my text or my calls, and i desperately need some clarification to move on. i think I may have been to hasty in ending the relationship, and am having doubts but my pride wont let me go to him and apologize, i don’t think I should be the one to do it first. Any insight is greatly appreciated.