I need FWB advice....what are YOUR rules?

You can't go backwards in a relationship. If you have with someone you can't tell them "Lets go back to where we were when we weren't having ". IT DOESN'T WORK THAT WAY. If there is an emotional attachment and you don't want one then end the relationship. You can't expect the emotional attachment to recede when you're doing the most intimate thing possible with someone. Grow up.