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				Originally posted by devnull  
This girl was my first, but after we broke up, I was with a number of other girls over the last three years.
			
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 Well this is easy then. You're attached not because she's all you've known, but because you actually really feel for her. You've had other relationships, most especially you were able to feel deeply about another girl (even just 1). Take her out to a nice dinner or something similar, just the two of you. Ask her about her feelings about you and her. If she says she's just your friend, move on. If she professes she still feels for you, then try and make something with her.
My main point is that it's not you, psychologically, that's the hangup here. You're not conflicted on her. You're just experiencing jealousy and nostalgia like everyone else does. This means that either she wants to be with you again, or she doesn't- in which case, just move on. You'll find something better.
Good luck, keep us posted.