UPDATED: NOV 2021
Someone was going to do something but didn't.
was going to + verb + but
- I was going to walk to the supermarket, but it started raining.
- Bill was going to buy the car, but changed my mind.
- She was going to go to Paris, but got sick.
- They were going to go to the movie, but it rained.
- I was going to study English at Berkeley, but changed my mind and went to San Diego instead.