Mal : We'd be together forever. You promised me.
Cobb : I know. But we can't. And I'm sorry.
Mal : You remember when you asked me to marry you? You said you dreamt that we'd grow old together.
Cobb : But we did. We did. You don't remember?... I miss you more than I can bear, but... we had our time together. And I have to let go... I have to let you go.
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From: Inception (2010)