Hey Mel,
Just on your DH's ex, my uncle's ex wife did very similar things, and although I don't think she wanted to get back together with him or really even liked him, she definetly hated the fact that he had moved on and I think she just hated not having his attention. So everytime things were going well and everything was quiet, she would start
up some kind of drama with the kids, like just messing with the visitation days etc. It was so sad as it was the kids that suffered because of her. Maybe attention isn't the right word, maybe she just likes to be in the middle of a drama. Well, I am so glad this hasn't affected your <------lol, I just love that one, it just so cute!