Advice pregnant and don’t know what todo

I found out I’m pregnant. I have a 7 year old. My daughters dad would be the father of this baby, he doesn’t think he is the dad. He’s also saying that if I don’t have a abortion he will not continue a relationship with my 7 year old and the new baby.

Me and him don’t have a good relationship, there’s really no relationship. in the 9 years I’ve been dealing with him he’s cheated who knows how many times, even had another child with someone (kid is about 3 years old). What hurts more is how I don’t feel like he acted this way towards her when she told him that she was pregnant. I know I need to leave him behind I’ve tried so hard and it’s not easy but at this moment I can’t continue to even deal with this craziness…

Advice ??? What would you do in this situation?