It sounds like your Son is pretty grown up already.
I would sit down with them and explain to them how marriages work. How delicate they are... how much risk there is of outside interferences.
They are dating age and its good for them to learn that "trust" isn't a safeguard for a relationship of any kind. That is important, but if all you have are two wreckless people who trust each other the relationship is headed for the crapper.
I would sit with both of them, teach them about relationships in GENERAL, and then explain that there are some interferences in your own marriage - FACEBOOK and XBOX.
Explain to them you two are gonig away for a weekend to START learning more about this stuff. Explain that they are free to ask questions, but to NOT approach their father abotu any of this right now because he's dealing with a lot.
This is an opportunity to bond with your kids as adults.
Take them to a restaurant or something so you know your H won't overhear or interrupt... A SAFE place. But introduce it as a relationships 101 course in general first... They will do MUCH better in their own marriages later on for you taking the time out to educate them NOW... better to learn this stuff NOW than when they are 43 right?
