Mack | Kara.
That he'd misjudged him, over assumed how twisted he was. He'd walked away from the team willingly because of how much his presence hurt them. He'd apparently made a choice for your betterment at his own detriment. Even if he wasn't going along with Coulson's plan, the one he had gone with was less destructive than had been anticipated.
We were keeping you confined until we could be sure. You might not have been brainwashed, but you were still a potential danger with the loyalties that you showed. And all you did was prove our concerns correct.
And even if the kidnapping was all your idea, he didn't exactly return her once he met up with you.