Do some people never get over an ex?

I would say that jealousy is playing a huge part in the behavior she is displaying. But you cannot control how she feels about you because you have done nothing to her. It could be (and I think this is it) she sees the relationship you and your husband have, and regret has set in. Instead of trying to cope with those regretful feelings, she turns to anger and takes that anger out on the one person she cannot have: your husband. She diverts some it towards you because you have become "the one" and she is no longer a viable option for him. Keep your chin up, don't let this destroy your new family, and pray