Should I confess to someone who already has a boyfriend I have a crush on her if she suspects me and asks me about it?

I have a crush on a girl who already has a boyfriend I only saw twice in my life. If/when I see her again should I tell her I have a crush on her if she suspects it and asks me about it? I'm trying to avoid confessing my crush on her out of respect to her and her boyfriend but if she herself asks me I believe I should tell her
Should I confess to someone who already has a boyfriend I have a crush on her if she suspects me and asks me about it?
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