Two scenes:

Love, Actually, even though it's completely cliched. I love the whole speech, how he even writes "I say this without hope or agenda". Honestly, it's so charming, but it speaks even more strongly to how much she loves her husband, to stay with him even after hearing a most honest declaration of love from someone else she cares about deeply.

I can't find the youtube clip for the other scene, but it's the scene in Reality Bites where this exchange takes place:

Lelaina: I was really going to be somebody by the time I was 23.
Troy: Honey, all you have to be by the time you're 23 is yourself.
Lelaina: I don't know who that is anymore.
Troy: I do. And we all love her. I love her. She breaks my heart again and again, but I love her.