I wasn't going to exercise, but...
I was going to call you last night, but...
They were going to get married, but...
I wasn't going to eat dessert, but...
They weren't going to invite him, but...
He wasn't going to buy a new phone, but...
I wasn't going to do the homework, but...
She was going to go on a roadtrip, but...
We were going to watch a movie, but...