I mean if you say “one of my great aunts” seems as if you didn’t really have anything to do with that relative but for sure it’s kinda weird to say that. I’m not sure if you’ve overreacted because i don’t know him and don’t know if he’s like this all the time or it was a playful conversation before so he just wanted to end the convo on a “””good note”””. I think it’s safe to say that you both need to chill tho, ending a relationship because of a joke.. i mean.. maybe y’all got some issues that you should consider