If he hasn't responded perhaps he is no longer interested. Or is it possible that your parents have taken your mail from him?
You have three choices: 1) stay and marry the man that your parents want you to... you may or may not learn to love him. 2) leave, take a trip, and go see your boyfriend... which may work out, but there is the chance that he is no longer interested. 3) tell your parents that you can not marry anyone right now and give yourself more time to figure out how you can best live the life that YOU want.
Your boyfriend may not be the right man for you either and in time you may meet someone that your parents may approve of as well.
Only you know what the consequences might be for any choice you make. If they are too severe, then you may just have to follow tradition. If not, then now may be the time to speak up and break tradition in your family.