How can I prove to my boyfriend I'm not cheating?

Anonymous
(long distance relation ship but I'm going to be moving where he is at the end of the year when I finish my schooling) My boyfriend thinks I'm cheating on him because I go out with my "friends" (as he says) through the day and thinks I'm cheating on him with someone else.. I've told him that I only want and love him but he doesn't believe me :/ no matter how much I try and convince him... Now he thinks I'm just a big slut and is having sex with other guys.. I'm a virgin I haven't had sex with anyone and I'm saving myself for him but again he doesn't believe that...

I just don't know what to do anymore :( and ideas how to make him believe me? cos I'm all out...
How can I prove to my boyfriend I'm not cheating?
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