I hung out with my ex this weekend we had a good time she stayed with me Saturday night and Sunday then Monday she won't return my calls what the

What is she doing to me

What do you expect from her because after all she is your ex and owes you nothing.

Maybe you should stop doing the things the two of you did as a couple. If your going be friends then be one without crossing any lines.

If you can't and want more from her then your not capable of being a friend to her.