I guess I'll be the mean guy but it sounds like kinda an immature relationship. You both claim to love each other then when you make cracks that are the kind you make with your boys she breaks up with you.
Love. Ha, that sh*t doesn't exist man. We're all in it for ourselves in the end. It's our nature to survive. Love is what a mother has for her child and vice versa. But to love someone else outside of that bond, mere illusion.
3 weeks? you're young man, you're gonna meet a lot of girls. i don't want to tell you it wasn't love but the intense feelings you have as a youth over girls can be a little romanticized and unrealistic.