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It all depends how you broke up.
by the sounds of it you probably left on bad terms
I'm sure you are feeling that its your fault that the relationship has ended, therefore in your mind she can get away with doing what ever she wants as she has made you think you deserve it.
BINGO!
I had the same problem quite a while back after mutually ending a long relationship with a girl, she took it worse than I did and subsequently I felt like I was a dick and would feel awkward whenever I saw her.
The way I got over this was by her being invited to a friend of mine's party and we had a nice chat. Since then we've been great friends and best of all, NO AWKWARDNESS!
