I don't care how many years a couple has been together. If a friend dies around the time of an anniversary, I'd consider the friend's death to be more important. But if you're having ongoing problems, you should talk with him about why it doesn't feel like you're in a good place.
A person doesn't have to be seeing someone else for a relationship to become stale. Sometimes we just grow apart or lose the passion and interest for no apparent reason. But that's reason enough to reassess and consider moving on. If the guy can't meet your emotional needs, perhaps he's not the right guy for you.