hello

I'm sorry your feeling sad and you are being treated that way.
You need to look after yourself and your baby and make you both the priority. Congratulations also on your news of a baby pregnancy can be hard as it is. I think maybe you could benefit from some counselling for your self to help with feeling sad all the time and even if we want to help another person we can point that person we can about in that direction but ultimately its is there own choice to seek help and get help them. There is some really good advice and different situations that you may find helpful through others posts here and on the tools page.
I am a single mum for my two my ex with cpstd started disappearing for weeks when I was pregnant with our second child and he left when our son was 8 weeks old and to this day fluttering in on when it suits to see the children. Personally emotionally my son has no idea who he really is as he's only seen him at best 10 times he's now 18 months our daughter struggles because she doesn't understand why her dad is angry alot and doesn't see her anymore but I started a realationship with a friend who was untreated bpd and it was conflict alot of the time and I was trying to help him with the pain he felt but also equally he couldn't cope with the struggles or understand certain things which wasn't appropriate like turning up at 1am screaming at me about something or other and our realationship made me feel very low and then was in paxting on my children. I can say, after the breakdown of my realationship with my exbpd. I am happy and have found some calmness that took a while to get to as I never really knew where I stood and was walking on eggshells.
Is it possible that you can talk to friends and family for emotional support. He may want to be there for your daughter.
If you feel you can't do it anymore and your feeling hurt by his actions.
Then you need to find some strength.
if you want to try to rebuild a realationship and it still might not be what you want from a realationship with him as he can continue to do the same. I can understand why it feels like your trapped It's hard.
He can still be there for your daughter but it also be that your happy too even if you decide I will raise baby on my own and try co parenting you have your own stability.
Take care