I've got this sentence, but am not sure. Should I use were, or was?

"You were (was) going to tell me about my mother, when we were interrupted," Neel said. He took a sip of his iced tea and looked at his father.

were

Of course were.  "I was, you were, he was, we were, you were, they were."

Thanks. I don't know what got me so confused. Must be tired.

Know the feeling, Dan.

Grammar can be confusing sometimes. Sometimes even if you know the correct word to use you still are not confident and have to ask. You can google these types of issues if you want to get an immediate answer. We use " was" with only he, she, it, and singular names. For the rest "were" is used. Hope it will not confuse you next time. Also in the present tense, we use "s" or "es" with he, she, it, and singular names only.