Should I ask for a break from our relationship?Watch
You just have to be honest that you're not really feeling it anymore. Seeing her at school is not the end of the world everyone goes through stuff like that. Just smile if you see her but no need to chat. Just treat them like anyone else in the class, nothing special.
Either stick with it, talk to your girlfriend and sort out the issues, or end it. Ignoring the problem for a few weeks will not make it go away!