Should I talk to him?

Sam

This guy and I used to really like each other but then he got a girlfriend. We still spoke and got on really well while he was with her.

They’ve broken up now but he’s gone all distant from me and I’ve just found out he was speaking badly about me behind my back. I’ve done nothing wrong to him and now I don’t know whether to just ignore him completely or go and speak to him and call him out for talking about me ??!!