I think he's just fed up with her for now... he's been CLOSE with her and reality sunk in and he's running... to YOU
Two years from now when reality sinks in he will be looking at OW again or a third female to escape to.
This is WAY TOO EASY... I don't buy it.
And sorry to burst the bubble, but he has exposed to two people :
You His best friend
THAT is EASY... let him try telling everything to YOUR FATHER... I suspect he is gonna avoid that one like the bubonic plague...
If he DOES meet with your father and own everything and your father's impressed then I am too... But right now telling his best friend and you isn't a huge climb.. you KNEW most of it and his best friend... well, its his BEST FRIEND... not a major hill to trod over there either...