I keep liking girls and they seem to like me and flirt with me & then I ask them out they say no and we don’t talk much anymore, why do girls do that?

When I say they seem like they like me I mane that they show all of the signs most commonly they try to touch me unnecessarily for example when sitting down next to each other. Of course there are more signs but I don’t want to type anymore

I keep liking girls and they seem to like me and flirt with me & then I ask them out they say no and we don’t talk much anymore, why do girls do that?
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