Why does your boyfriend accuse you of sleeping around?

If you're not sleeping around, then more than likely the problem is with him and not you. He may have issues that cause him to be insecure and suspicious. He may not love himself and may not be able to fully accept your love. He may not have been properly loved as a child and can't understand what faithful and loyal love is. His parents may have cheated on each other and he's grown to believe that lovers cheat. He may be cheating himself and feels that if he can do it, you might do it, too...It could be lots of things. Try to sit down with him and have a heart to heart discussion about it. Hopefully communication will help him to break through some of his barriers and take steps to trusting you.