Dating my best friend boyfriend friend?

I just started dating my best friend boyfriend friend(they are best friends too)The thing is i don't really know how to handle the situation if me and the guy im dating break up or if my best freind and her guy breaks up.how do i handle the situation should we set ground rules or what.how should i handle the... show more I just started dating my best friend boyfriend friend(they are best friends too)The thing is i don't really know how to handle the situation if me and the guy im dating break up or if my best freind and her guy breaks up.how do i handle the situation should we set ground rules or what.how should i handle the situation.i need help.thanks
Update: i just need help on how to handle the situation in general
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