What episode did Abby and Mcgee go out in, and what episode did they break up in?

They were never actually in a relationship! They started dating after Sub Rosa (Season 1) then things went pearshaped after McGee asked were their relationship was going and Abby was happy just to leave things as they were! They only dated for half of the season!

they never showed that in any of the episodes. SORRY!

tình yêu em both and would be nice if they get together:D