A and B cannot be friends or have a successful husband and wife relationship unless they both have the same goal in mind.
The goal of doing everything with Khoda in mind.
When they both bring Khoda into their lives than everything will be for Khoda.
Working, eating, having family, making friends, dealing with people, business, etc.
Khoda is the only stable thing in people’s lives. Aim your goal to the skies and never take your eyes and heart off it.