WHY DOES HE SLEEP ON TOP OF THE COVERS FULLY DRESSED?

O.K,SO I'V BEEN DATINNG THIS GUY FOR ABOUT 4YRS NOW AND HE HAD RECENTLY MOVED IN WITH ME ABOUT 7MONTH'S AGO AND WE USE TO HAVE A GOOD TIME BUT RECENTLY HE HAS BEEN SLEEPIN ON TOP OF THE COVER'S EVERY NIGHT AND I FEEL LIKE HE IS TRYIN TO AVOID ME...WHAT DO YOU THINK I SHOULD DO ABOUT IT????.