Why when a crush start liking me back, I don’t like them anymore?

It’s happens all the time when a crush starts to like me back I feel like repulsed even though I had a crush on them, like I just want the attention or something, but I need advise, any girls that are like me how do you manage to get a boyfriend when you avoid them when they like you back?
Why when a crush start liking me back, I don’t like them anymore?
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