Essentially the title.

I was in the gym and saw a cute girl but with a buff, handsome guy. Kinda proud of myself to not have chickened out at this point, so I approached with the line of "You guys make a cute gym couple", well received but with some hesitation, so I asked "You are, right?", where the guys denied. At this point, I could've said sth along the lines of "Honestly, I though you are super cute " (to the girl obv) but I didn't bring it over myself. Any tips how to handle such a situation?