This isn't what I imagined at all...

Well I'm pregnant with my ex's baby... Long story but he did this to try and trap me. We were together up until I was 8 weeks pregnant. I have a 2 year old with my current bf(we were on break and I was going back and forth with he and current bd) I know it's a lot but anyway, he's being an ass about the whole situation. He wanted me to himself but I guess because I wouldn't shut out my 2 yr olds dad hes making me go through the whole pregnancy without him. It's fine because I'm not alone but it's kind of disheartening because I want my kids to know their biological father but at the rate we're going, he won't even be there for delivery. My question is do I reach out And let him know what's going on or just continue to live my life and take care of my kid. He is perfectly capable of reaching out to me but I just want opinions on what you'd do. Like I said I have a bf and he's perfectly fine raising this baby but I feel like it's not fair to my child to potentially miss out on having his other family... Idk I might just be emotional. I want to add that this is both our 3rd child. I would like for my son to know his brother And sister on his dad's side..