Don't feel physically attracted to my fiance

I don't mean to sound shallow writing this, but I'm engaged and everyone else who is engaged seems to be head over heels for their fiance. I don't really feel that way. We've had some problems that we're in counseling for (namely he's really depressed) and I don't know why, but I haven't felt very physically attracted to him for a while now. Is there something wrong with me?