If you and your boyfriend are in a committed relationship and have NOT agreed to see/date/have sex with other people... then yes... something sacred is broken. If you are feeling deprived, then try to spice things up while he's gone. Send sexy letters or pictures. Masturbate with thoughts and images of him. Set up a time to have an intimate phone call. There are lots of things you can do to help your relationship through this difficult and lonely time.