Does your wife have an extramarital affair?

You can always ask someone to leave.

However, you cannot force your spouse out of your joint home without court involvement. If you would like her out of the home, you should file for divorce and request temporary and permanent sole possession of the home. State laws vary, but a spouse's adultery can sometimes be used against her in the division of assets and debts.

To find out exactly what you can expect in your state, you should make an appointment with a qualified family law lawyer.