Throwaway because duh.

So, to preface, I have a severe addiction to masturbation. I've always been a horny bastard, but I've kept it under the wraps for my girlfriend, who probably wouldn't be too pleased about finally knowing why I was taking so long in the washroom. I've picked up a bad habit from my fapping adventures, and that's been unconsciously jerking off regardless of what's in front of me. I guess because I've been doing it so much, I do it without even thinking about it, regardless of what's in front of me. I could be watching Teletubbies, and I'd be idly masturbating, not even aware of what I'm doing. It's sort of concerning, but I guess I don't really want to look into it too much. Anyways, I've gotten into bodybuilding, and I wanted to get a good sense of the sort of posing I wanted to do. After watching a few videos on this, my girlfriend walks in, and she just sees her boyfriend cranking it to buff dudes in underwear posing. Obviously, she's pissed, especially since she says she doesn't like me masturbating. She asks me what the fuck I'm doing, asks me if I'm gay, and then after an argument, just walked out of the house.

TL;DR: Picked up a bad habit, got caught cranking it to guys.