Hello XXIV: I'm sorry you are in the midst of this most difficult situation.

Unfortunately, since the two of you will soon have a child together, this is still just the beginning of a long & probably difficult relationship.

I wish there were some sage advice I could offer. But I don't believe there is. Perhaps other members, here on PC, will have some similar experiences & suggestions they can share.
I see this is your first post here on PC. So... welcome to PsychCentral!

I hope you find the time you spend here to be of benefit.
Here are links to some articles, from PsychCentral's archives, on the subject of how to handle toxic people & relationships along with links to articles on the subject of personal boundaries:
https://psychcentral.com/blog/whats-...deal-with-one/
https://psychcentral.com/lib/11-thin...-toxic-people/
https://blogs.psychcentral.com/child...-toxic-people/
https://blogs.psychcentral.com/unsha...-toxic-people/
https://blogs.psychcentral.com/lever...-toxic-people/
https://psychcentral.com/blog/how-to...amily-members/
https://psychcentral.com/blog/why-he...ries-in-yours/
https://psychcentral.com/blog/3-ways...ip-boundaries/
https://psychcentral.com/lib/10-way-...er-boundaries/
I don't know, of course, if you're here simply seeking advice with regard to this particular concern or if you plan to continue posting.

However, should you be planning to continue on (we hope you do)... may I suggest you introduce yourself over on PC's New Member Introductions forum? Here's a link:
https://forums.psychcentral.com/new-...introductions/
There's a lot of support that can be available here on PC. The more you post, & reply to other members' posts, the more a part of the community you will become.

Plus there are the chat rooms where you'll be able to interact with other PC members in real time (once your first 5 posts have been reviewed & approved.) So please keep posting!