You were drinking with your roomate when he punched you in the face for getting angry when he pulled your girlfriend into his lap. When he snuck into your room, you pretended to be asleep and waited for your girlfriend to scream and tell him to get out..
When your car broke down, you were wary to leave your girlfriend and asshole coworker alone together as you ventured into the nearest town for help, how she assured you she'd be fine. Ten minutes after you left, your coworker had your innocent girlfriend
Your tiny cock was never going to satisfy your girlfriend. Be a good boy and suck on your bully's heavy nut-sack while she deep-throats his Alpha shaft.
That necklace cost you over a grand and put you in serious debt; so you'd recognise it anywhere. So seeing your girlfriend wear it while being mercilessly fucked by your asshole neighbor stung all the more.
You were worried when your girlfriend told you she was going to tutor your bully. She told you nothing bad would happen because her roommate would be there.
Your bully invited himself to your apartment. He met your girlfriend and remarked how disappointed she must be with you. She just giggled. When he told you to get him a beer, you realized you didn't have any and had to go to the store real quick. You were