Will someone ess this situation?

My boyfriend has been asking me for a y pic for (4) years. Long distance relationship. We met before he went back to US bec there's where he lives/works. I've been reluctant to give it to him, for some reasons. Blackmail, or how he would view me. When one time, he begged for it, & gave me no chance to resist him, i sent him the pic. but w/o my face. I told him that "I'm surprised of what i can do for him. But it seems that he went mad, and told me, I don't trust him... I can't understand.. Who has more right to get mad... me or him...?