Ah Mz. J, what an awful thing to learn. I can understand why that terms "numerous women" and "most of time these things don't develop into anything" have been echoing in your brain, zipping at your ear like an annoying mosquito. How horrible. But maybe he was referring to his previous affairs, the ones back in the 1990s? He was unfaithful back then, and is at least emotionally unfaithful with this current OW now, but maybe it hasn't been pervasive over the years.
So sorry you had to hear that J. I hope to God that it isn't what it sounds like.
I'm glad your MIL has recovered, and your FIL is no longer considering a suicide pact (I assume!). It will be lovely for your H and kids to see them. But the border guard is not going to let you go into Canada without a passport. The days of being permitted to cross with a valid picture ID are gone. No need for you to be the "bad guy" saying you don't want to go (and no the feeling that you just do not want to see them right now is NOT wrong), you will not be permitted. I think the time alone while they're gone will be good for your PMA. A good break from child care while dealing with MLC craziness will be good for you!
Linda
Me 65, Ex 64 M 38 y 2 adult S, 4 G-Kids MLC 11/07 BD 12/09 D 3/14 Dating nice guy 7/14 Engaged to nice guy 12/17