I still feel bad for the ex gf (I'm only in ch 6 so far), I mean the cheating part was brushed of to the side and there was no accountability whatsoever shown by both mc and ml. But I also think that it was probably because of comphet (idk if its possible for men) like he never felt "true love" from his previous girlfriends unlike now that he's with a man he only felt that way, that's why it was taken very lightly. I don't approve of cheating, but the feelings and realization of mc was very realistic. I hope the girl gets to find the dude she deserves!
If this wasn't an omegaverse, mc would be the type to not choose between the two of them and lead a stable marrying off to a woman. Then the two of them would be stuck with each other for years until they're ready to admit they want actually want eo so bad