From Season 2, Episode 23 of The Flash
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lyrics
Barry: "Why does it feel like I just lost?"
Iris: "Because you've lost a lot in your life, Barry. More than most. But... maybe you and me, seeing where this thing goes, maybe that can give you something for a change."
Barry: "That's all I've ever wanted to hear you say. And I wish that I was in a place where I could try that with you. But I feel so hollowed out inside right now. I feel more broken than I've ever felt in my life. If I'm ever gonna be worth anything to you, I need to fix what's wrong with me. I need to find some... some peace."
Iris: "Barry, listen to me. You waited for me for years. You let me get to a place where this was possible. So I am telling you I am gonna do the same thing for you. Wherever you need to go, whatever you need to do, do it. And when you get back, I'll be here."