Ooh no no no.. How HE makes himself look is not your problem! Clearly they don't have kids to think thats a joke - and frankly anyone who thinks that its fine for him to just go getting drunk at a pub (premium prices I might add) every damn weekend when he has a child to look after is as shallow and vacuous as he is being.

He has chosen not to be your fiance anymore. You dont have to do or not do anything because of how he feels anymore. His feelings are no longer your concern. Just like yours aren't his. Remember - he is the one who "doesnt love you because you are boring". He didnt control you in your relationship, he has even less control now. Don't sit there alone because he might look bad. Reach out to whoever you need to.