WHEREVER YOU WILL GO- THE CALLING
He missed her.
Plain and simple. After she quit, he fell hard.
When she married Chase, he shut down completely.
Everything that was building up over the years came to a head after that, and that's how he landed in a psychiatric facility, albeit because of himself.
Maybe he wanted to prove to Cameron that he was good enough for her, even though he knew she already knew, but he wanted to make sure it was on his own terms.
No matter how much he denied it, he would always love her.
No matter how far away she was, or that she was married.
He would also suffer in silence; he was not a home wrecker.
But if she needed him, he would be there, as himself, as a person who would never say he needed her, but that his actions would scream.