Single Motherhood, never thought this would happen to me...

Found out yesterday that my boyfriend and daughter's father has been unfaithful, more than once. It's breaking my heart, not only did it happen a couple months ago, but it just happened again this past week. I am 6 months pregnant and I feel like my world has just came crashing down all around me. If You have been through this before, do you have any advice on how to move on and move forward? I deserve better than what he has been doing to me, and I decided to leave him. Such a hard decision but my baby is who is important to me now, not him. Any advice on how to move forward? Thank you! - Nichole