Why does he have to show off his new girlfriend to everyone?

Anonymous
Noticed lately how much my ex shows off his new girlfriend and it's p***ing me off. I know it shouldn't be but for the several months we were together he wanted to take things slow. He has only been with about six weeks yet they already share mutual friends. I was there for him when he needed someone to talk to about all this sh*t that was going on in his life and it was if I didn't exist to anyone else but him. I mean seriously what is the point making his relationship with her public on Facebook so the whole world can see? It was never public before and his relationship with her is the only thing he does make public. I'm slowly starting a relationship of my own now and don't see the need for everybody to know about it. Why the publicity stunt with her? I feel like telling his friends and her about how he was chatting up women on dating websites behind my back and how he told me to dress up like a tart to make other guys jealous of him. How does such a narcissistic pig get into a happy relationship so quickly while I was left with all the guilt and depression and was "completely at fault" when he dumped?
Why does he have to show off his new girlfriend to everyone?
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