Your bully lied and told your girlfriend you cheated on her. She was so angry, she didn't even bother to check if it was true. She went out with "friends" and sent you this picture saying "Hope she was worth it"
Walked in on my gf getting railed by a bbc. Turns out it was my bully. At first I thought it was a problem, but then she convinced me to watch and help out with whatever she or my bully commands.