Family drama

I am 13 weeks pregnant and 2 months from being 18. My boyfriend lives with his grandparents and hadn't told them that I was pregnant and has been keeping it from them. While I was at work yesterday my mom and sister showed up and told his grandma that I'm pregnant (I didn't know this was going on, ive already talked to them and yes I'm mad but theyre family I'm forgiving). But his grandma freaked out and said I need to jump off a bridge or get an abortion. My boyfriend is mad at my mom and said this is all her fault and I have to choose between her or him and said if I don't move in with him and his grandparents he's signing over his rights and going to be out of my life. Sorry but I feel like what his grandma said was way worse than my family telling her. He is defending his grandma and saying she had a right to say that. I don't even know what to do I'm hurt and the fact he is talking bad about my family and said he wont ever come over to my house again hurts me. What should I do?