Help please !!

Help ladies I’m 6 months pregnant and my BD wants to leave me I don’t want to coparent I want a family. He says he’s looking out for what’s best for our baby but all couples have issues that’s no reason to leave. He’s also been trying to collect evidence on me to “protect himself “ Incase I don’t let him see the baby which he knows I would never do that but his mom got that in his head. We’ve been good until we had an issue because of his family and now this. It came out of nowhere. Please any advice would really help.