I want to prevent my kids from getting too close to my ex-husband's new wife. How do you like me now?
Why don't you want them close to your husband's new wife?
I don't like her and I don't want my children to like her more than they like me.
I'm sure you're jealous of your ex-husband's new wife, but she is now their stepmother and she has a right to spend time with the children. She's not their mother and will never replace you so you should not be so worried. Try to accept the situation and make the best of it, tension will be harmful for your children.
It's just not right. She spends way too much time with them than I do.
Jealousy can get the best of all of us, but it's important to not let it control us. Let the kids be as close as they want, because if you separate them they may resent you.