What would you do?

Hi everyone I want to start off by saying this is abit of a long one and I am aware no one can make my decision for me but I want to know if u was in my position… what would you do? I have literally 3 days to decide before they send out the pills and I’m really struggling.

I have a 15 month old already with my ex of 4 years on off. I know I can’t be with him because he’s not good for me or my son. I have now fell pregnant from a one night stand and I’m 6+4 pregnant. At first I was 100% keeping but now I’m on the fence. This guy is a guy I have no feelings for whatsoever I have been seing him since finding out I’m pregnant. He already has a 4 month old and one on the way I found out after we already slept together otherwise I wouldn’t have. Wich puts me off aswell. I’m scared because I’ve always been in love with my ex and I know this will ruin any chance one day but I know he’s not good for me at the same time so maybe it’s a good thing. I’m scared because my son already doesn’t have a dad around and he will watch this one going to their dads and it breaks my heart. I wanted my second baby to be with someone I loved and who loved my son and took him on as their own aswell as their own baby you know?I know I’m not going to be with this guy😭 i want my son to have a proper family and at this rate I’m gonna have at least 3 baby dads because I know this one ain’t and it’s like this almost random person is going to be in my life for the next 18+ years who I’ve never had feelings for😭I feel really detached from this baby but don’t feel like I can live with getting an abortion as I feel like this is a child and will struggle with the what ifs but at the same time don’t feel like I will be happy or be able to live with keeping either because of the what if I didn’ts. One min I’m keeping next I’m not I feel so guilty as it’s not the baby’s fault but I’m trying to think of my self and my already existing son to 😭thank you so much to anyone who reads and responds in advance you will really help me out