Definitely, Maybe2008

[after Emily turns down his proposal, and admits she slept with Will's roommate]

Will Hayes:
I thought we had a plan.

Emily:
No, Will, you had a plan. Will, you have a really big plan.

Will Hayes:
No, I'm pretty sure we both had that plan...

Emily:
I just can't keep pretending that I want to be part of it anymore.

Will Hayes:
Uh, you were there when we made it, so...

Emily:
And I didn't know how to tell you. How do you tell someone that you care about that you don't want the things that they want anymore?

Will Hayes:
The best way? Definitely having sex with the roommate.

Emily:
That was cowardly. And I'm sorry.

Will Hayes:
Oh. Good. You're killing me.

Emily:
No, I'm not. I'm letting you go. Cause if we stay together, Will, we're gonna be miserable. I'm gonna hold you back from all these incredible dreams that you have. And then eventually you're totally gonna hate me for it.

Will Hayes:
No...

Emily:
Yes! Will, I don't want that. And you don't want that. Trust me. You're gonna be just fine, Mr. Hayes. Without me.