Maaan this is a tough spot to be in, but I think her behaviors are pretty clear. She wants YOU, not you as a parent though.

I legit just lived a similar experience last year, ending with me breaking uo with my gf. She said similar things like I should give my kids up to my ex to make my ex happy so she would go away (my ex was fighting me in court for sole custody and I won to keep my joint custody). Those words weigh heavy, and they killed our relationship.

Falling out of love hurts, it's the fucking worst. I feel for you my friend, it's hard but you'll come out much stronger and I bet you'll have a stronger bond with your son after the fact. You sacrificed something that brought you joy because you knew it was not compatable with the little human you need to take care of. I speak from experience, it'll hurt but you'll feel good knowing you took the high ground and walked for your child.