I am so sorry! But you are doing so well to stand up to H and defend your position. And Karen and Kat took the words out of my mouth. The OW can go take a hike! Don't feel one bit of regret for her -- she got involved with and knowingly pursued a married man. In fact that second encounter sounds exactly like she was expecting H to chose her, even though she admitted that she now knows he is a liar.
Your H is a d*mned fool -- and you know what they say about a fool and his money!
As for the pets, your H can take a hike too! That is just mean-spirited of him to try to hurt you and your DD's just because he has to give up his precious "pet" too.
The nerve of these WAS's!
Hang in there, dear one. You are going to make it just fine, even if it means your H gets flushed down the toilet.