My girlfriend just left me, this is awful.
That sucks. Did she say why?
She wanted to try something new, she was bored of me.
Wow that's harsh.
It is, I don't know what to do anymore, any ideas?
Find a new girlfriend.  That ship has sailed.   If you're really still want her consider trying to play the jealousy card.  (ie; make her jealous)
I'm gonna do that, thank you for the advice. I could try to kiss someone else to make her mad.
You don't even have to do that. Keep it classy. Just show up with a pretty girl and have a good time and be a perfect gentleman.  Dont even bat an eye at her.