I am no one to judge, but all this focus and attention on the individual in the western civilisation makes it impossible to be with one person for a long period of time as one never remains the same person. I can’t help but feel sad for you. May be because I myself am struggling with similar emotions.
Just wanted to ask you one question if its not to personal. When you grow old, when ‘choice’ and ‘sense of self’ becomes meaningless, wouldn’t you want your best friend by your side? or What if you change after a few more years as a person - Will you get divorced again if you are married then ?