My boyfriend engaged to someone else, why did he leave me

Hello pandit ji, my name is Tanya, DOB 11 Oct 1995, born at 4:15 PM in Delhi. I was in a serious relationship with Rohan (DOB 17 May 1991) for three years. I genuinely thought we’d get married. Last month, I found out through a random Instagram post that he’s already engaged to someone else. He never even broke up with me. Why did this happen to me? Was there no real connection from his side?