I was riding down the road today and this truck getting ready to make a left stops, giving me the impression that he is waiting for me. Not wanting to keep the guy waiting I stood up and started pedaling as fast as I could so I could get by him as quickly as possible... as soon as I took about 10-15 pedals he guns it and makes the turn...

I had to slam on my brakes and skid across the road, just barely missed T-Boning him...

Now I don't know if he did that on purpose or he changed his mind.
I didn't say anything but I gave him a dirty look and when he seen that he stopped and stuck his head out of the window to play tough guy... Amazing he can stop for that but not to let me go by.

I had no problem if he would have turned right away, but he gave me the impression that he committed to waiting for me to go by and then did that...

Was I attacked?