Scared, my ex husband wasnt bi, but he cheated on me with my sister while I was 7 months pregnant all the way up until our son was 3 months old. I was on doctor ordered bedrest & my sister moved in to help with cleaning and cooking. He also cheated on me with my stepsister & tried with my cousin & cheated with my neighbors wife. A cheater is a cheater regardless of whom they cheat with. And, while I do believe that cheaters can change, to keep doing it or looking for hook ups online, is a good indicator that he has no intention of stopping. It is very emotionally dangerous for you. And its potentially life/health threatening to you & your unborn daughter. Im ashamed to admit this, but 7 years ago I had an affair. And altho my husband has forgiven me, theres a lot of anger on his part (understandable)& it interferes with our marriage on a daily basis. Even though you feel that you can accept your fiances infidelity, it will always be in the back of your mind. Ive been on both ends of infidelity and its damaging and gets more so as time goes on. I hope you can make the right decision for the long term instead of for the here & now. Because you dont want to be stuck with someone youll never be able to fully trust. Its horrible on both of you guys. Take good care of yourself and your baby girl.