Do I go back to a relationship that I know won’t work for my sons sake??

I’m really lost on what to do im 9 months pregnant I’m going to give birth to my son next week. His father and I have been split up since I was 4 months. So I’ve gone thru a little over half the pregnancy by myself. It’s been fine, I’ve actually been happier and been doing good until the last week or so I started really missing him and getting super emotional and depressed. I feel like I’ve failed my son already and he’s not even here yet because I couldn’t make it work with his father. I left him because he stole from me and my family to support his drug addiction... and because he possibly cheated although I’m not 100% because there was no solid proof. We’re trying to make it work now but it’s just not the same, and I’m scared of what will happen if I don’t get back with him because he’s threatened in the past to fight me for full custody... he’s apparently off drugs now and is working for his dad doing better. But I still don’t feel like I can trust him I mean who would after what he did? Even to this day I have a security camera in my room and my money kept in a safe with a code because now I don’t trust anyone. I honestly don’t know if I could pretend to be happy for 18 years, but I want my son to be happy. I want to give him a family ... my mom raised me as a single mom for the majority of my childhood and she was absolutely miserable being a single mom I don’t want that for my son 😓 like I just don’t think it’ll work but I’m scared of what will happen if I don’t try to make it work.

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