Relationship

I was in a live in relationship with my boyfriend since last 2.5 years only because he promised me he will marry me . I even visited his home one year back. After coming from his home i even asked him several times what was his mother’s saying about me as his wife. He always said his mother liked me and the day i say i will do engagement he will just do it. However i am 25 year old and my boyfriend is currently 29. Our relationship was public and even in office, colony everyone knew about this. My boyfriend only told everyone that i am the girl he loves and he will marry. But suddenly now he got engaged to someone else though my belongings are still kept in his room. I was shocked. I called him so many times he didn’t pick up. Laster his parents called me and threatened me over phone. It been few days after this incident my boyfriend called me and said me he doesn’t want to marry me anymore. I asked for the reason. He is not giving any specific reason. Sometimes he is saying his parents won’t accept sometimes he is saying i was delaying his marriage he wanted to get married. After listening this i said i am ready to marry you now. And if your parents are not accepting then why didn’t you tell me this thing earlier. I would have left you then. And if you wanted to marry as per yours parents choice then why did you ask me to stay in live in on the name of marriage and keep getting intimated saying you will marry me. He had no answers to this question. What should i do?