“Steve Rogers-You know, it's kind of hard to trust someone when you don't know who that someone really is.
Natasha Romanoff-Yeah. Who do you want me to be?
Steve Rogers-How about a friend?
Natasha Romanoff-Well, there's a chance you might be in the wrong business, Rogers.”
Chris Evans - Steve Rogers
Scarlett Johansson - Natasha Romanoff

“- George Halley: I don't trust any of my friends.
- Panama Smith: The feeling's mutual, George. They don't trust you either.”
Humphrey Bogart - George Hally
Gladys George - Panama Smith

“Another piece of motherly advice. Don't confide in your girlfriends. If you let them advise you, they will see to it, in the name of friendship, that you lose your husband and your home.”

Lucile Watson - Mrs. Morehead

“I have many friends in Casablanca, but somehow, just because you despise me, you are the only one I trust.”

Peter Lorre - Ugarte

Lesson learned. No such word as "friend". It can only end badly when you let someone get too close.
Vin Diesel - Riddick