Giving all your attention isn't a relationship, it's an obsession, and obsessions are unhealthy, not good. A relationship absolutely should not absorb you completely, and if it does, that's a problem, because it means you're neglecting your family, your friends, your hobbies and interests, and any career/school/whatever other life you have.
It's a good rule of thumb that your spouse should be the most important person in your life, but even in that (most extreme) case they still shouldn't be the only person in your life.