How do I talk to my X after a break up?

Be a man. You should be the first to say something. You don’t have to be her friend; just don’t be a jerk and deny her existence.

Ask to get a different locker. Or just ignore her. Or you could say “Hi” and carry on.

The absolute best technique is to acknowledge her presence if you happen to make eye contact by saying her name, nodding your head, and then getting into your locker, doing what you need to do, and leaving. That way, you are neither rude, nor friendly. She can neither complain about you to her friends, nor misconstrue your intentions.

I hear that you don’t want to talk to her.
I imagine you’re having some pain around it… sounds like you’re annoyed, frustrated, and pissed off.

I don’t know what you should do. That’s a tough situation to be in. Good luck.

It’s been a week? What have you been doing up until now? If you thought enough of her at one point to make her your girlfriend, she must not be all that bad. Just nod or say Hi and go about your business. It may seem awkward now, but it will get easier. Consider it practice for future break ups with other girlfriends.

My motto is this: If you can’t be friends after you break up, you never should have dated in the first place.
Except of course if they cheat, abuse.. you know.. stuff along those lines.