I'm my sitch, as you well know, my kids are teens and already had figured out most of the bad stuff. It was an easy decision for me to be sure that we told the truth about what was going on, because my kids would've seen through anything else.
I spent a lot of time worrying about how "telling the kids" would play out. Like you, I read books constantly, and search the threads here for answers.
Two things come to mind: your kids are very young. 1) Tell them just what they need to know to handle the worse time of their lives. As they get older, the truth about your situation will all be sorted out anyway. 2) be careful about how you tell them "it's not your fault". I understand that kids will often hear just the "your fault" part. This was certainly the case in my own parents divorce, and I was 16.
Sorry I haven't been around much. Still been thinking about you and lurking. Hang in there.
Only you know your kids; and you'll lead this situation.
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