Showing The Obsession by Christie Gordon

As a senior-year art student at a Santa Barbara university, Tristan is
caught in a mental prison of his own making. Sexually repressed and
emotionally abused by an oppressive mother, his preference for men leads
him into sexual addiction. Then a new roommate appears in his dorm -
Collin, a stunning psychology major from class he's fantasized about
since the start of the school year, a young man Tristan's fallen in love
with from afar. Collin uses his charm and knowledge of psychology to
pull Tristan out of his self-destructive existence and into a tumultuous
affair. But Collin has a secret, a secret that could potentially
further damage Tristan and send him plummeting farther into isolation
and desperation than he's ever been before. Will Collin's secret emerge?
And will Tristan move forward and find the love he's always craved or
will he fall headlong back into addiction and lose everything he's
worked so hard for?