Maybe he needs to see a therapist as well? You said everything was going great until 6 months in. I can't speak from personal experience since I've never been in a relationship longer than 6 months. But I've always heard from friends and read in magazines that 6 months to a year is where things start to slow down. The new romance feeling is over and you might be falling into a routine which could make things less exciting. Maybe try some new stuff to spice it up a bit. Good luck