He works his many hours and goes home to an empty condo at the end of each shift. He is content in his life and has no desire to take a chance of sharing it with another man. He's tried that a couple of times only to have his heart broken because his partners refused to be faithful. After a particular hurtful break-up with his last boyfriend David he makes a decision to not allow himself to be put in that position again. If he doesn't get involved he can't get hurt. Simple as that. So he avoids all temptation when it comes to relationships and does his job and goes home.