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The only thing is, I want to call the kid out.
He's an AFC twat. He's not good looking. I want to make him look the idiot.
Because actually, I find it disresepctful to me as her boyfriend.
I don't think I can call the kid out without looking like a massive control freak.
It is super disrespectful! But faggots like that will always be there.
My ex had a picture up looking sexy and some twat commented: "And that's where i belong next to Xx Love you

"
This kid was someone she knew in real life and had been hanging out with so it bothered me a lot but really all it is is Facebook, he isn't fucking her doggy-style so in a way be proud of having a girlfriend who is wanted by other dudes.
At the other hand i do know what you mean by making him look like an idiot and disrespecting you like that, my approach would be in your situation something funny but serious enough to let him know to not fuck with you.
"You wish it, i got it

" something along those lines. Your girl cant say your taking the dude serious and he knows whos boss.