Well...he's already been excommunicated from the family, fired without references, told to leave, and is living alone--without Cody visiting him--much to his own disappointment. And all of this just from outing Matt to his parents.
My guess is he'll go back home to his adopted parents, and hook up with Cam Heely...who will find out what Brian did to Matt, and beat him nearly to death and without any evidence to tie him to the crime.
After the beating because of things said (with disguised voices) while he was being beaten, he will apologize--sincerely this time--and attempt to redeem himself to Matt and the family, after which his behavior will remain consistent in that track and he will become happy with Cam back east, never knowing it was Cam that beat the crap out of him--although Matt and either Brad or Robbie (my vote would be Robbie because of what he did to Neil) would find out through a letter from Cam, which they would decide between themselves to keep secret and burn the letter in their fireplace.
Eventually, after seeing Cam and Brian together, and experiencing a verbal apology (since he had already written) from Brian who breaks down during a hug (because of his beating and subsequent issues concerning his own mortality) and discloses to them that he was severely beaten--not knowing Matt, Robbie and Cam already know--Matt and the family accepts his apology without actually warming up to him as a family member again, at least not right away. While Brian will be depressed because of this begrudging acceptance, it will strengthen his personal relationship with (addiciton to?) Cam, and his behavior will settle down, he'll keep working on his relationship with the family, which will eventually warm, although not to 'intimate' levels but cozy social levels (being able to get together, socialize and have fun without trouble).
Eventually he'll end up working with Crampton Construction, the Cramptons won't ever know of this illegitimate son of the patriarch although they'll notice the physical resmblance in looks and think of it as just a coincidence, hired into a branch office in Western Pennsylvania and living with Cam, a successful, 'Out' public official. We then won't hear from them except during holidays. Eventually the two of them will adopt several gay children and live, happily, if not a bit hectically, ever after.