What Did Jesus Mean When He Said We Should Wash One Another’s Feet?

Questions about using the services of a Christian photographer who took professional photos for a divorce mediator, what is being symbolized by Jesus washing the disciples’ feet in John 13, and whether it’s okay to live with a member of the opposite sex if you’re not sexually active.

• Should I not use the services of a Christian photographer who took professional photos for a divorce mediator?
• What is being symbolized by Jesus washing the disciples’ feet in John 13, and what does he mean when he says we should wash one another’s feet?
• Is it okay to live with a member of the opposite sex if we’re not sexually active?