Trust issue

I am in a relationship with a boy who don’t trust me…it’s because of its past background…I can understand that…he think that I hide things from him…like chatting with boys.. meeting other boys…he always doubt…but God swear I never do that…I tried to explain him but he never listen he think that he is  right he is not ready to accept my honedty…he think I am a liar..I have done everything to clear his doubt but he dont believe in me…he doubt about my character…what to do…he is very angry man…help me