What should one do when a girl gives you hints that she likes you then suddenly changes when you open your heart?

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Realize you screwed the pooch, try to learn something from the deal and move on.

Main thing to realize here is that it’s not okay to dump your emotions onto a girl just because you like her. I realize that it’s something you feel like you really need to do but this isn’t the 1800s anymore, women like fun and romance, not heaviness and brooding.