You gotta understand it. He doesn't know if this guy is shaking you down or taking advantage of you...
7 seconds sound clip from the Casino (1995) movie soundboard.
You can hear this line at 01:17:22 in the Blu-ray version of the movie.
Quote context
[...]
- So why did he have to do that, huh? Tell me.
- I know it wasn't a nice thing to do...
- No shit.
- No. I told him all about this guy before we ever got married.
- This is no fucking surprise.
- Oh, you did? I didn't know that.
- He's just a friend of mine I was trying to help. So what?
- You know, the first time I ever saw you guys together I never saw him so happy.
[...]