My girlfriend have been together for months and it has been the perfect relationship. It couldn't have been any more perfect, we were both 20 and that was great because I don't like older girls.
Now she is fully aware that I despise the thought of being with an older girl but recently she decided to suddenly turn 21 despite her promising me she wouldn't. Now I'm still 20 and this cunt went back on her fucking word. I DON'T LIKE IT!

Should I stay with her or is this unforgivable!?!?