His ex is faking a pregnancy

His ex is faking a pregnancy to try to win him back. We have a mutual friend in common but the mutual friend is her best friend and she told her that she was going to try anything to get him back to her. And it was via text and the best friend sent it to me. I told my boyfriend and he said, “I’ll just wait and see if it’s true or not but right now we should end things, because I don’t want to bring you into drama”. I’m so distraught idk what to do.

Yes he did cheat a few months into our relationship but he apologized and I took him back.