Ty Lee’s ~total hots~ for Sokka, again from the Avatar wiki:
Ty Lee and Sokka first met in Omashu during a prisoner exchange, and naturally were enemies of each other. […] He and Katara were almost finished off when Appa disposed of Mai and Ty Lee, launching them into a nearby river. Ty Lee later told Mai that Sokka was “kinda cute”.
Ty Lee and Sokka are presumably friends now that the War is over, but since he is in a relationship with fellow teammate Suki, it is likely that Ty Lee respects this fact and has moved on.