My partner & I were both married & divorced from other people many years ago. We've been living together for 18 years & are very happy together. For us, marriage is just a piece of paper. We've taken care of estate stuff through wills, so we can take care of each other if something should happen to one of us. I think there's something about living together by choice (rather than by law) that keeps us growing as a couple.
Do what you feel comfortable with. There are so many different choices & paths to discover these days, LIteraryLark. It's important to feel at peace with the choices we make...especially since peace can sometimes be an illusive thing for folks with mental illnesses.