I agree with Bill to keep an open mind. Ask him if you really want to know but I would personally try to be careful about making him feel bad or making him feel pressured. You could also just tell him you heard about his girlfriend and you sincerely hope he is happy. Try to stay positive and keep an open mind about the whole thing. I know you feel hurt... that’s probably best to be mostly expressed to us here and maybe you can work through those feelings first before you talk to him about that... I would feel hurt too... I have been in your shoes... many times... Staying positive and open minded in these situations has helped me the most. That’s my personal opinion of course... coming from the heart as I know how hard it is... and in no way meant to be forcing any advice on you. ❤️