Good communication is vital if you are in a relationship with a Pilot as they will be away a lot. So long as there is good communication in the relationship you shouldnt have reason to doubt what your partner is doing on their layovers.

Can pilots wives travel with them?

How would you like to fly together? The odds of coordinating your schedules may be slim, but many airlines have no policy against spouses working the same flights. In fact, Delta even did a special write-up about a husband and wife who recently flew a shared flight.