How do I move on after putting so much effort into a girl and it fell apart?

too long to explain everything but liked this girl and felt like i had a genuine connection with her but things like just got weird and left with more questions than answers now and really upset to be honest.

i'm not sure how to move forward and maybe its my fault as like maybe it was not a realistic option to begin with even though we seemed to get along and knew each other in real life.

How do I move on after putting so much effort into a girl and it fell apart?
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