Why did he change?

I met this guy back in June. His social media didn’t indicate he had a girlfriend or his Instagram stories that he would share. She was never mentioned or brought up by him either. However, recently out of nowhere he stopped talking to me and he started to post photos of his girlfriend on his Instagram story. After check out her page it appears they’ve been dating for a almost a year. I’m curious to the change of behavior. Did she find out something and he’s doing damage control?

Why did he change?
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