Is he cheating or what?

my bf and i live 2 hours away from each other we spend about 48-55 hours a week together we have been together for about 5 months today i was on his face book and saw a private comment from the chick he was sending xoxoxo and :)..... i love him and he tells me he loves me and stuff on sunday he took his fone to the shower i asked y he sed to listen to music which he has neva done before should i be worried shoul i ask him about it if so wat do i ask help me plx he is my everything but i dont wanna be hurt wat is goin on