M.D.
Oh man :(. I'm sorry you are going through this. As you can tell from what you are feeling now (kind of remembering the good and forgetting the bad), time heals all wounds.
I would be most concerned about what my kids saw/heard. I don't think either of you should bring dates around the kiddo's until it's serious and the other parent has met them. I wouldn't want sleepovers when the kids were there, and definitely not people in and out.
I have a good friend who has been divorced for about 2 years now and her ex still has different females in and out of his house - the girls are now 11 and 6, and it's just horrible to see what they are seeing is okay on dad's end.
You are an AMAZING mom so I know the kiddo's will be protected from any heartache that you can humanely protect them from.
Otherwise, I'm really sorry I don't have more advice. I really wish I did!