I’m going crazy

My boyfriend and I broke up in October. We recently started trying to fix things again. Of course In those months I had my fun and apparently so did he. Two weeks ago he breaks the news to me that he’s having a kid with a girl he met in November. She’s two months pregnant. I’m going crazy. How am I supposed to be okay with this? I have no idea what to do I’ve just been crying and crying. I don’t think he understands this is a huge deal...