Draw some lines, then stick some fence posts on them. String barbed wire between the posts, and leave a small space for passing, and a common area where both can mingle. Observe.
you
fence-------------------------------] pass area [---------------------------------------
common area
fence-------------------------------] pass area [---------------------------------------
her
If you don't do this, your marriage will wither on the vine, and die a horrible, prolonged, gargling death. Dont intrude on hers without invitation, she doesn't intrude on yours without invitation. The common area will contain the majority of your private issues in a healthy relationship, and the private areas will contain minimal things, but those minimal things are what will keep you sane. You've been warned.