Do you think it's pathetic to wait for someone?

say the person you love already is in a relationship. when you were falling in love, you didn't know that. would you tell them that if it doesn't work out with the other person, they should consider you worthy of their time? That is, in future if they break up with their partners they should get it started with you.

I personally think it's pathetic.
Do you think it's pathetic to wait for someone?
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