If a guy tells you he used to like you

So there's this girl... I've always cared about/treated her really well, without the intention of getting into her pants (srs). Unfortunately I've started falling for her recently, but I know she isn't right for me - I don't think I'd want to be in a relationship with her. Still, I think she's seeing another guy and it's really depressing - I can't stop thinking about her. Completely paradoxical I know, I don't know why I'm in this ****ty state of mind. I won't be seeing her over the summer and I feel like I need to get it out before then, as a sort of catharsis. Telling her I like(d) her would be the cathartic part, but then clarifying that I don't any more would be the 'retaining our friendship/establishing in my mind that nothing can happen' part. I think this would reset my mind into normalcy again, the only question is whether she'd see me differently afterwards? I don't want to make her feel awkward and jeopardise the friendship. On the other hand, in my experience, when someone finds out that a love interest is 'over' them they start to want that person more (such is the human condition). I'm quite sure she did have feelings for me a while back, but I've friendzoned myself over a period of time. So girls, how would you react to a guy you may have liked in the past who tells you this?

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