If you been

If you been in a relationship for 4 years and more but you and your SO took a break for like a year and then yall got back a year later and you found out that he got a chick prego and the chick is 9 Months and about to have the baby your so In love with him nd really love him would hear it out from him nd listen nd try to stick it out or just up and leave and wouldn't think twice? I really need help and opinions