Is it a good idea to tell my ex's wife that he tried to get me to go out on a date with him?

I feel very guilty and I want to clean my conscious but I don't know what to day. My ex told me some weird things, that he's bored with his marriage, he's not satisfied by his wife and he cares about me. Granted, I've already concluded that he wants to get in my pants but I think his wife is a good person and mother and she deserves to be told about her douche bag of a husband. I made the mistake of flirting back with him before I realized that it was very wrong to encourage his infidelity so is there anyway I can come clean to her without making her hate me for the rest of our lives.