Affair

My friend has been having an affair with a man that has a 6 month old and fiancé ... It's been going on about six months and I've tried to tell her to end it, but she won't listen. The guy has no intentions of leavening, but then she tells me yesterday that he wants to get her pregnant.... WHAT?!? I'm like I can't believe you would even put yourself in that situation, who are you? He's told her he isn't leaving, so why would he want to get her pregnant? His poor fiancé