Nita, it must be very distressing for you to have this suddenly happen. Everything you thought was normal is now changed. I agree with you that something is very wrong with the boyfriend. I wonder if his mother has a hold over him, like  something to “blackmail” him with or simply telling him he will be cut out of the family forever if he marries you. I don’t have much advice except to acknowledge that this man is tied in some way to his mother and you can’t fix or change it. You may never understand why or how he has changed. I think it is easy for me to say now you have to let go of him but I don’t really see any other choice that makes you the priority. I tend to see people’s behavior for what it really is. Somehow this boyfriend finds it easier to do the arranged marriage and give in to his family demands. Now is the time you protect yourself and look after yourself. I think this man showed you a side of himself that was false. He didn’t marry you because he was not willing to make his family angry. They basically “own” him which is not good for him or for you. Its really tough to love someone who can’t love you back in the way you need him to. I think you will feel huge grief for quite a while. You may feel rejected or bad about  yourself. This is really about the boyfriend’s lack of character. It is not about how you failed in some way. You did not cause this and you can’t fix it. He made a choice to abandon you. This is not a good person in my opinion but he hid his truth from you or you didn’t want to see it. I don’t know if you have counseling in your country or if there are grief groups. This can help you heal. The thing now is you have to protect yourself and put your own needs first right now. Start to widen your friendship circle if you can. Do nice things for yourself. I am so sorry. This sounds like a nightmare. I have known several women who thought they were in good relationships and then the man ups and leaves, but this happens to men also. The partner or spouse just goes on to live another life with another man or woman. It feels like betrayal and rejection and there is often great sorrow, maybe depression, maybe stuck in fixing the man or woman so they come back. It is hard. You will get through this and you deserve better than a false partner. I wish you much healing.