What exactly crosses the line from a friendship to an emotional affair?

Anonymous
i have a friend who I’ve known since high school, we are both married with children, but that an intensely close friendship. Our other halves know we are friends, but not the extent we speak, or how deep and meaningful our conversation get. I’m also so comfortable around him, I could get changed infront of him etc, nothing physical has ever happened, mainly becus he didn’t want it too. We hug and hold hands when we are alone, but other than that we are just really like best friends, we tell eachother anything and everything, he’s my number 1 best friend.
What exactly crosses the line from a friendship to an emotional affair?
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