I don't want to use their names so let's say we have friend A and B and boy 1 and boy 2. friend A and boy 1 are exboyfreind/girlfriend. friend B and boy 2 are good friends.
Since A and 1 broke up, and B had a crush on 1, B asked A if it'd be ok if she got with 1. A said it was fine and she didnt like 1 at all anymore. So B really started liking 1!
other half of drama... 2 really liked A. So B set A and 2 up. They dated a bit and 2 said he really liked A, A knew this and said she really liked 2 as well.
well... A and 1 started liking eachother again. A had a party last night which myself, B, 1 and 2 were all invited too. But A did not let them know that she started liking 1 again. So A and 1 were all over eachother last night, knowing that 2 and B were there and watching. Needless to say 2 and B are very upset that A betrayed them like that.
Sometimes guys get between friends, and she made the choice to let it happen.