"You think so lowly of me? I'm hurt." Ares didn't keep all of his promises all of the time - that was a well established fact, but he tried his best. He tried to be there for people even though that probably wasn't of much consolation - he was destructive by nature, not constructive, not helpful, not someone you could count on for support or healing.
"I'm here for you. If you want to talk, if you want to tell me anything, if you want to take it out on me - whatever. My time, my ears, my body, my mind - they're all yours. I can't help you by making it go away, or ease the burdens off your shoulders, but at least I'm here and I can take anything you want to throw at me."
She had been there for him, and now he was here for her.