To me it sounds like that is depression talking. You don't divorce your husband of 13 years, whom you love, because of a few months of blah. Yes, it's normal to feel like room-mates. Yes, it will pass. But depression can play a hoax on your head and make a normal little bump feel like something huge. You do need to talk together or somehow express how you feel, not only about your relationship, but other things that are making you feel miserable. But he can't cure your depression for you. Professional help is probably a good idea, but don't forget the obvious things: less stress, healthy food, enough sleep. I haven't been there, but if you're seriously/clinically depressed, medication can be a good way to catch your balance.

I don't mean to sound flip, but I truly believe that a long relationship takes persistence and patience, and sometimes you just ARE room-mates. And I know first hand how depression can just make everything intolerable. If you're going to think about a divorce, do so when you're "happy", i.e. feeling stable and have been so for several months. That's the only time you can make solid, wellfounded decisions.

Maybe he has no idea you're sad, just sees that you're snippy and annoyed, and don't seem to like him anymore. Maybe he's upset about something else, and isn't aware of how he's pushing it over onto you. Maybe he desperately misses the way it used to be but hasn't got a clue of how to get there, and needs your help.