Need serious advise pls???? this thought is really driving me crazy?

my bf who was so committed/good/understanding suddenly broke up with me jus b coz of tat one ques i asked him "r u misusing me" from that day he got annoyd and stopped calling me inspite of convincing and so many sorries still not coming bk to normal he says he had beed so committed but inspite of tat i asked him this and so i never trusted him and this was really hurting to ask him like tat & made him like i killed him and his luv tat he had for me and now he does not feel like the way he used to feel b fore for me???? how can a guy who was really so sincere so committed change so easily in a span of one week????????just b coz of that one statement...i agree tat it was too hurting but inspite of me trying to convince him my situation that made me ask him tat ques still he is not ready to realize... he says whatever it was how can u ask me such a thing and dont try to justify your words...... i m not able to forget him i want him back but is tat possible.....