In marriage, two become one. The individuals still has beauty on their own, but without the other something is always missing. To take the missing bead back, both rosaries would have to be undone. When you come to the spouses bead, let it be a reminder to pray for them, and say that Hail Mary with all you got. Keep their sanctification on your daily thought.
“Have no concern for money, love your wife more than you love your own life. Never be at odds, but be true. Prefer her company at home above being out. Esteem and admire her publicly, and advise her patiently. Pray together, go to church, and discuss the readings and prayers. If your marriage is like this, your perfection will rival the holiest of monks.” St. John Chrysostom