How do you tell a man, who decided yesterday that he doesn't want to be with you, that you're pregnant?

We started dating 2, almost 3, months ago. Things were fine until they weren't. I started noticing he didn't spend as much time with his daughter as he said he did, and he had almost no interactions with my children. We would be blissfully happy for a few days and then he would stop communicating and I would go nuts from lack of communication for a fees days. That's how it has been for the last 3 weeks. I know he hasn't been seeing anyone else because we live together with roommates. Our roommates are lesbians, so no he couldn't be cheating with them. Last night he said he wanted to talk later but refused to speak to or acknowledge me all evening. When I got a chance to finally speak to him he said he had been thinking about if he wanted to be with me or not based off how this last few weeks had been. He chose no. I don't know how to tell him I'm pregnant and I can't help but feel stupid for getting pregnant. It's been 9 years since my last pregnancy, and that's not without trying. But I wanted this to be with someone who truly loves me, no matter what. I can't help but wonder, "Now what?"