My ex-boyfriends girlfriend is being a right brat towards me?

wow, been there. Shes threatened by you. she sees that he is still protective of you,and it makes he feel like he wont always be on her side in other aspects of life. Trust me ive been the jealous girl friend before, and if she keeps acting the way she it it will back fire on her. Just take what people say about you with a grain of salt because most people talk out of their own insecurities. dont pay attention of the toxic people in life, because all that matter is that you have an awesome boyfriend and what sounds like an amazing ex boyfriend turned friend:)