I'm drunk and on a dare to cheat on my girlfriend
Is there any other reason behind you doing this?
I don't really love my girlfriend
Drinking is fun but if you overdue it is bad for you. It can lead you to make bad decisions like cheating.
That's why my girlfriend doesn't like to drink much.
If you realize you're in a bad situation because you are drinking you should get out of that right away before you do something you regret.