Every hear stuff about someone your dating

That made you doubt them in some ways? For example you heard stuff from ppl you trust about the partner you were with that you really didn’t want to know? Example: a good male friend of yours that said :Bro she used to hit on me and say I’m was so sexy and stuff ,while she was dating her old boyfriend .And now you find this out while your dating her and your like 🤔🤔🤔🤔 this isn’t good to know ?