So I just found out the father of my baby isn't my current bf who has been talking about getting…

So I just found out the father of my baby isn't my current bf who has been talking about getting married after the baby it's my ex's. I called my ex and he was be sympathetic and sweet and wants us to try again for us all to be a family... and I told him I'm willing to try but my current bf has been ignoring me for 2 days and I think he's even cheating... im not exactly sure how to bend it with my current. I think it's best for the baby to grow up with its father... I didn't have that and ik I was pissed 90% of my life.