Okay this is unfortunately serious and you are going to have to try to move forward from him as best as you can. I know it is hard right now, but over time you are going to think about him less and less and eventually you will not miss him anymore. Right now you are in a state of grief over this loss, and if you are patient and giving it the appropriate amount of time you will get over this. Some tricks that might help you would be to write a letter to yourself and pour out all your thoughts and feelings about him and this whole situation, you do not want to hold back at all. Then after you are finished you want to dispose of the letter in a way you find fitting, usually people like to burn the letter. This is going to be a cathartic experience for you as you release your emotions and thoughts for this man both figuratively and literally.
Another technique would be called thought blocking where you want to use a rubber band and put it on your wrist 24/7. Every time you think about him you want to snap the rubber band causing a mild pain. This mild pain will help to remind you to refocus your thoughts and also your mind will start to associate mild pain with this man and will subconsciously try to prevent you from thinking about him as well.
Lastly this is a good book that can help you move forward from a break up that can be a good resource for you.
"Getting Past Your Breakup: How to Turn a Devastating Loss into the Best Thing That Ever Happened to You" by Susan Elliott
It is very possible that he does like you, but he wants to honor his culture and parents as that is important to him as well, so he may feel forced to go through with this marriage.
I hope this answers your questions and gives you some guidance on this issue. Please let me know if you have any questions or concerns as I am happy to assist and support you regarding this issue.
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