Five Stages
Denial
He was not jealous, he was not gay so there was no point in being jealous. He just didn't want to be fired; he just needed to show Cameron up. He didn't want to be fired, that was all. It had nothing to do with the smallest amount of praise he would get from House, nothing to do with it.
Anger
He couldn't be gay; he couldn't like him. He was years his senior for Christ's sake! He couldn't help but feel hopeful, however, when he was asked to stay behind... only to storm out in anger. House was infuriating.
Bargaining
He had slept with Cameron (as much as he loathed to admit it now) and he had kept sleeping with her, like sleeping with her would change his feelings; if only he could ask God - to change him... to at least make him bi-sexual. He would do anything, he'd go to church once more. He'd ask Cameron out on a proper date and not just for sex; he would do anything... but when House calls, he just can't say 'no'.
Depression
He wasn't... he couldn't... House, it would just give him more to torment him about. He didn't want this, he didn't ask for it. Why him... and why House?! Why not Wilson?! Wilson would be kinder about it at least. God, he needed help. Why couldn't he just be straight? Normal. He was a god damned poof... and nothing, not even his rendezvous with Cameron would change that.
Well, this was it. He could either act like Cameron and deny any feelings he had for House, or, he could take his own approach. It would certainly give him the message; however, he was rather afraid of his reaction. So, the next time he was asked to stay behind... he didn't leave for quite a while. It was then, he found, House was just as surprised as he was when he kissed him. Quite surprised and rather accepting.