Am I an a-hole for thinking of this while having a girlfriend?

I’m in a temporary job until my career gets back to me. And there’s a woman who reminds me so much of my girlfriend. That I even feel like telling her that, but it would be creepy. Like same face and hair. I feel so guilty staring because she’s a brunette thinner version of my girlfriend (my girlfriend is thicker and blonde). And today a really attractive girl flirted with me today. But I don’t think I should tell my girlfriend. It just had me thinking that I could’ve been with someone like that if I didn’t find my girlfriend. But I love my girlfriend than any woman on earth. Still I feel guilty.

Am I an a-hole for thinking of this while having a girlfriend?
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