Tired...of each other? Of the relationship? Of life in general?
I ask because what bearing that feeling has on your relationship depends on what you mean, but it also depends on what you both think and feel about it. For sure, if people in a relationship feel tired of it, instead of feeling like it's benefitting them, that can be a strong cue a relationship isn't serving the people in it anymore, and it may be time to move on.
Other times, people can be tired of certain patterns or dynamics, which sometimes can be changed with effort, other times cannot, and other times still maybe can be, but one or more people in it all don't want to make the effort.
Have you two talked recently about the status of your relationship, how you are both feeling about it, if it's still meeting boh of your needs, and what you'd like to do about it on the whole?
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead