Nothing weird happened between her and I - but. Well, it was all... [He gestures, because that's what you do when words are hard.]
The flood. I don't even know what's going on or if she - ["even likes me"] is worth figuring out. Her name's Gwen. [And yes, please read into the fact Karev is trying to still sound unaffected, projecting his issues of 'does she like me' to 'well I don't even know if I like her'. Less hurt involved if it's your choice, right?]