Why do guys not pursue me when they think I’m attractive to them?

I’m 23 and still single 🙂 I have had a number of times when I went to parties and stuff and met new people. After the party the host would tell me some guy said I was cute or pretty. But these guys never bothered to ask for my contacts or anything.

Like is there something wrong with me? Why do guys say I’m attractive behind my back but never even try to get to know me?
Why do guys not pursue me when they think I’m attractive to them?
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