i would write him a letter explaining the truth, and tell him that if he dosent answer back , you will not bother with anymore explanations, in trying to explain  to him. tell him that you have tried  and now its up to him to accept your explaining of the situation that occured. a word of advice to you in life we can only try to ammend these situations, if the person is not willing to talk and understand  then in my opinion he just dosent want to and dont care enough...just go on with your life and be strong and independent..after all how much can we beg for forgiveness...its not worth it...hope it all turns out well for you.