Asking for a friend: I’ve been having an affair with a married man for years and just found out his wife is pregnant. I feel so betrayed

Q: I’ve been in a relationship with a married man for a good few years now. He assured me he and his wife were more like friends and didn’t sleep together any more. Our relationship has been great so far, and it suits both of us to see each other when we can. I overheard that his wife is now pregnant, and due in the next couple of months. I feel sick to my stomach. I can’t believe I bought his lies, and that he kept this up throughout the rest of her pregnancy without mentioning it to me.