Did you ever have a crush on someone who already has a boyfriend or girlfriend?

Yesterday I went to the birthday party of a friend of my parents. I was introduced to the girlfriend of someone my brother knows from a football club he often goes to. I was immediately attracted to her and I couldn't stop staring at her. I ocassionally talked to her. She reminded me a little of Amy from Big Bang Theory because of her appearence and how she was dressed. I got a little upset when she left. When I returned home I thought a little about her and today when I woke up I immediately started to think about her despite knowing she already has a boyfriend. I mean I'm not upset she has a boyfriend surprisingly. I'm just upset I have a crush on someone ALREADY KNOWING she has a boyfriend
Did you ever have a crush on someone who already has a boyfriend or girlfriend?
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