Not sure how to feel better about this..

I have been with my girlfriend for about 3 months now... she says she is good friends with a guy who she's known a long time, and they speak by facebook/text and go to each others' houses sometimes. This is no problem for me, but the thing is I discovered that she liked him for three years before she got with me. They never went out and nothing ever happened, they were just friends, but she felt something for him for three years.. which seems like an eternity to me, even if she wasn't always doing anything about it. Since I have never liked someone I didn't go out with for more than a few months, it makes me think he must be really special. She says she loves me a lot, but I feel like it might be nothing compared to what she felt for him. The thing is, I knew her for a month or so before we were in a relationship, and she said she really liked me but she talked about a guy she had liked ( I didn't know it was him at the time) and I remember her seeming annoyed and upset because he had started to go out with someone who she didn't think was very nice.. and she was talking about him in a kind of bitter way..so to me it sounded like she was still attracted. I am just wondering if it's possible to get over someone after 3 years so quickly? She said she doesn't like him like that any more, but she is also a friendly person and I feel like I am analyzing the way she speaks to him, to see if it's flirty or something? The other thing is that, apparently he liked her too recently, but since he was with someone/she was with me... I trust her not to cheat. I just don't want to see this guy and it's awkward or something, and I wish I could stop feeling paranoid. I can't tell them not to be good friends, but I wish I could stop feeling inadequate. Does anyone have any advice? Thanks.

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