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Most Helpful Girl
If I am over a guy I have no interest in meeting up with him. If I run into him randomly I'll be friendly (unless he's a real dickbag or it was a nasty break up, in which case I'll ignore him), but I won't go out of my way to see him. What would be the point in that?
Not wanting to see an ex doesn't have anything to do with whether or not you're over them - it has to do with whether or not they are someone you want to have in your life and, if so, for what reason. Also, even if the ex is someone you could see yourself being friends with, if you're not 100% sure they're over you then you wouldn't want to get together for fear of leading them on or resparking their interest.
Generally speaking, unless you were close friends before you dated, there's never really a good, healthy reason to want to get together with an ex.1