Most Helpful Guy
This really all depends on the contexts of how the drinks are bought. If he is going around just buying drinks for random girls in clubs or bars, then it isn't a good sign for your relationship, but if he knows the girl, he could just be friendly. As for accepting a drink a girl buys for him, it is rude to refuse, however if he doesn't know the girl, it's his responsibility to thank her but also inform her that he is already in a relationship. Either way, you are right, not because of what is correct, but how you feel. You don't want your boyfriend doing those things and if he wants to be in a relationship with you, then he needs to respect your wishes. There are lots of girls out there that wouldn't mind, but you do. And he's dating you.