Okay, well as you can tell this is going to end up in court. I'm not sure because it's not directly stated, but I'm getting the impression that he has been either unemployed or very underemployed for most of the time you've been together.

If that's what the situation is, things could get very dicey so you definitely want to get an attorney and everything, including visitation and child support, needs to be in writing and court-approved. He can make all the threats he likes, but if he cannot afford an attorney to fight you it's likely he'll back down.

Don't continue having conversations regarding finances or who owns what with him, let the court decide.

For your next relationship, I don't care who they are, do not have kids, pets or buy anything, even a vehicle "with" anyone if they aren't going to legally marry you. While informal relationships can be great, when they go bad it gets really bad.