How often do you have unreasonable crushes?

It happens to me rarely to get a crush on a girl. But when I do, it's just ridiculous. I'm madly in love and for what reason? I literally don't know her besides seeing her casually among other people.

Yet here I am pining for her. Beautiful girls are literally EGERYWHERE! I'm talking to this beautiful girl and that beautiful girl.

And the one I have a crush on is literally the only one I can see. And of course, she doesn't like me.

I'm flirting with other girls and I feel nothing for them. I'm only flirting because they're flirting. I'm only flirting because I feel like I have to because eventually I will have to get over this girl I have a crush on.

It sucks because I know it's not going to go away and my heart aches for her. How stupid and silly is that? How can I have such a feeling for a girl I barely know? Shouldn't I only feel those feelings after being in a relationship with her?
How often do you have unreasonable crushes?
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