Do I tell his wife of our affair?

Anonymous
A colleague & I ended up involved with each other in an emotional/physical affair that started in February. He is married and has an 18 month old with her. (Please save the judgments/abuse here - I already know its all wrong and shouldn't have happened) It got very intense between us with him making comments about leaving his wife and asking if I am sure of my feelings for him & that I would stay with him for the rest of our lives if he did leave her, asking if I wanted kids etc and even saying once that he "wishes he was in a position to marry me" & things weren't so complicated.. He even asked his dad for advice. I didn't ever fully expect him to go through with it all but obviously hoped he might. In May after he'd done a lot of thinking on it, he told me he wasn't ready to start a new life again & didn't think he'd be able to cope with going through a divorce (he'd already had a messy divorce with his first wife, who he has a daughter with, who cheated on him and that caused severe anxiety which he takes medication for daily) I understood this & wanted to respect his decision as best I could. I asked him if he would ever tell his wife about us & his answer was no. he'd never tell her, he'd suffer the guilt himself, because he already knew she would never forgive him & that would be the end of them. I told him it's unfair, if I was in that position I would like to know the truth. I asked him if it was her committing the affair would he want to be told & he said he wouldn't, he'd rather live in ignorant bliss. I've toyed with telling her myself since that day - she's on facebok Since then things have sparked up between us a couple more times, with messages such as "I miss you" & flirting & a physical relationship at work. we were flirting recently, and he asked if we'd ever be capable of "just friends?" Anyhow, today I learned that two weeks ago his wife found out she was pregnant. Now I don't know what to do as its a strong reason not to tell her the truth?
Do I tell his wife of our affair?
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