Not sure to even respond to this or how to approach it

Last year my husband and I had issues with our marriage we both shut each other out. He started talking to a girl at work. They started hanging out after work and going out for drinks and dinner. Nothing happened between them physically other then a hug and her trying to kiss him (which I know to be true from a text she sent him apologizing for it). My husband has been very open about it and has apologized for having an emotional relationship with her and we are working on our marriage.

But what is driving me crazy is something they talked about that she told me when she tried to make their “relationship” into more then what it really was. My husband has Tourette’s and when we first started talking we were barley adults and I didn’t know he had Tourette’s (which clearly didn’t change my mind/feelings for him). But that night his eye twitched and I said something along the lines of “whoa your eye just twitched” not making fun of him just truly thought it was like a muscle twitch from being tired. Well anyway ... he told her that he never forgot that or forgave me for it. But yet we have been together for over 10yrs and have been married for 3. she told me this in October and recently I just can’t get that out of my head. Do I say something to him or just try to let it go?