After Art manages to save Wrex's life on Virmire, Art says goodbye to him. Wrex's reply:
Wrex: You've been the best friend I've made in hundreds of years. And if something happens, I'll have a tough time trying to forget you. Or wanting to.
Tali gets one in of her own with the You Are Not Alone example below.
Art and Tali repairing their friendship after her Loyalty mission, especially since it turns out she was terrified for him when he went off to save her father.
Art and Tali confessing their love for one another certainly counts.
Art plays counsellor to a random asari on the Citadel. He ends up convincing her not to commit suicide, gives her enough money to go somewhere else, and starts a chain of events that saves a number of lives. He didn't have a clue who she was, he just did it because it seemed like a good idea.
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