I bully you old man and fuck you until you beg me to stop and I suck that cock while it rises again in the bathroom and let everyone watch me do all that to you
First your bully seduced your sister and that was bad enough - but then he was able to use your sister to convince your GF to go behind your back and become his slut too
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"