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It sounds pretty much exactly like What Does She See in Him?. ...There's the alt title of What Does He See in Her? if that was what you were asking?
Well, the main reason that I brought this up was that, in the case I'm thinking of (it's a generalized version of something that happens in Cerebus The Aardvark), the trope title doesn't really come into play, it's more a situation of Bob's friends being repelled by Alice and disgusted with the way that Bob just utterly goes into a lovey-dovey haze around her. What Does She See in Him? (using the flip title) seemed to be the right trope, but I wasn't sure if this particular scenario fit or not.
Edited by Willbyr

Here's the setup: Bob and Alice are a couple. All of Bob's friends hate to be around Alice because she's a really obnoxious person, but Bob is utterly smitten with her and is oblivious to her flaws. Is this a special case of What Does She See in Him? or a different trope?