Please Help. Serious advice needed.?

I am in a relationship from 6 years.now my bf is ignoring me.he doesn't have other affairs.i am sure about it.from last year his family is suffering from several police cases.he said"we have many rivals in business and they are giving fake cases against my dad"recently whenever i am asking him whats his problem.he is saying i will tell u later.its 2 months over already.whenever i text.he says i will tell u later.he doesn't even receive my calls.i don`t know what should i do now.i cant leave him

Before 2 months he was saying me,we have some mysteries.( most probably he was saying this about his family).so i asked him whats that? he said some mysteries should not be reveled.and after few days.he started fighting with me for no reasons. i tried to make his mind and it took almost 1 month. then he said okay i will talk to you but i have problems and i am trying to overcome it. but whenever i am asking him.he is saying like i will tell you later.and he is not even receiving my calls.

I am really very much depressed..whenever i text him he replies i will tell you later.i even asked him about his problem also but he is giving the same answer. he is not even answering my calls. 2 months are over and i am feeling helpless. i don`t know what should i do. please help. i cant leave him.i truly love him very much..