Do your wants ever challenge your morals?

I'll use myself as an example: I knew a girl once, a few years ago. I really liked her and I almost got in a relationship with her. We had amazing chemistry and we had so much in common but she had to leave to another country and we just grew apart eventually. Some time after that she came back, but she had a fiancé. At that point; my wants started challenging my morals.
Do your wants ever challenge your morals?
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