We haven't seen him for a long time, so we didn't know.
3 seconds sound clip from the While You Were Sleeping (1995) movie soundboard.
You can hear this line at 00:13:11.024 in the Blu-ray version of the movie.
Quote context
[...]
- Excuse me, Doctor. What is she doing in here?
- Hey, buddy, she saved his life.
- I thought he was pushed off a train platform.
- Doctor, it's supposed to be family only.
- She's the fiancée, you idiot.
- OK, look, I'm sorry, you don't understand.
- We haven't seen him for a long time, so we didn't know.
- I always wanted him to find a nice girl. I'm so glad he found you. Oh, Peter.
- Why did you tell me that you were?
- I'm not engaged. I've never even spoken to the guy.
- What? But downstairs you said... You said you were gonna marry him.
[...]