Why do guys ignore/avoid girls?

Tia55
Why do guys approach a girl talk to her and then later on completely acts like she's not there, or why do they like you for a while and then act Like your not there?
So sonetimes when a guy likes me for a while or a bit and then we fall off, and I see him he acts like im not there. Why do guys do this?
Why do guys ignore/avoid girls?
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