Cheating

I'm not sure how common or uncommon this topic is.

But I'm wondering has anyone been cheated on while they were pregnant? How do you get over it, or deal with it? What are ways that's you can find some inner peace. I'm tired of crying, not sleeping, feeling depressed, and constantly thinking about it. I just want my family I had intended on, to be happy and have a healthy baby. But I'm having such a difficult time, even though my partner says they are willing to do whatever it takes to male it up to me, they want to marry me and be a family more than anything. I'm in a constant battle between my heart and my mind. How do I forgive? I just want to be a family.

Thank you for any insight.