Whoa there, teachme! I have to wholeheartedly agree with chasm54 and it is not about any anxiety disorder. My husband was attracted to me because I was independent, had my own life, my own friends, my own interests--I was (am) a whole person. Why would I stop being that after we married?!?
I like doing things with him, but after 25 years of living with each other, if we did everything together, one of us would end up taking a rake to the other. I need my space and so does he. What works for you doesn't necessarily work for everyone, nor does living differently than you indicate a mental health issue.