Alias, Season 3

Sydney:
[about Vaughn] You want him to kill Lauren...

Jack:
If he doesn't, it will eat at him like a cancer. The only cure is to end it now. She destroyed Vaughn's life.

Sydney:
Vaughn's life. Not yours. This is about what Lauren did to Vaughn, not what mom did to you. I don't know what you've told him or how much of all this you've orchestrated, but in some twisted way you got Vaughn carrying your burden. Trying to get you closure by doing the one thing you never had the chance to do - kill the person who betrayed you.

Jack:
I did have a chance. And I didn't take it. And not a day went by that I didn't regret letting her go. Vaughn will feel the same way. He will end up like me. And I love you too much to let that happen.