So I was driving home today from work. U know, in traffic. Either passing or being passed.

Then there was the common break in traffic. I was closing in on this G6, proceeded to pass and didnt succeed due to traffic. So... later on the ride, I catch back up to this said G6 and once again proceed to pass.
(keep in mind the G is in the fast lane I'm in the middle of 3) We lose a lane on an exit and I proceed to pass.

SHE then gets over in front of me and accelerates enough to pass the car in front of her. I'm like, alright... She then slows, so I change into the passing lane. She breaks HARD as if I cut her off. I continued like it was nobodies business. Then she pulls over into my lane... slowly but surely, creeping over. I did not GIVE and pushed her back into her lane (I suppose, I didnt do anything but continue) she speeds up beside me, looks dead into my window and flips me off.

What happened?