Relationship advice

So my boyfriend and I broke up in September, we both chose to sleep with other people... we decided to get back together around Christmas, but I found out I was pregnant. He told me that if it wasn’t his we probably couldn’t be together. So after going to the dr and finding out that I’m measuring right on track, we are still together, but he is such an awful person to be around most of the time. I know that he is hurt, I get it. But regardless I am pregnant.&due in September. &So now being 11 1/2 weeks pregnant.... and nothing has changed, even after numerous conversations. I just want to be happy, and I can’t even enjoy my pregnancy due to the fact of my boyfriend being a jerk and mean 24/7. What should I do?