WTF JUST HAPPENED? UPDATE

My bf of a few months just told me the girl he slept with before me is pregnant?!!!!!!! I can't talk to him right now, I'm mad AS FUCK and I just bawled my eyes out. Wtf do I do? He said he was gonna tell her to get an abortion? I don't know what to do or what to think. Update: apparently she wants an abortion and now he's saying if she has it, he'll raise it but he doesn't want her involved at all? PLEASE NOTE WE ARE ONLY 17 AND 18. Also unless you have experienced this before don't fudging judge me for being upset.