My partners ex is causing us problems?

Me and my partner have been together for just short of a year but unfortunately when our relationship started he was still living with his ex (he made it clear to her that they were separated and he was sleeping on the couch, due to money for moving and the situation of their two kids)
anyway. He’s now moved out and all of a sudden I’m being called a home wrecker and a slut. She’s literally stalking us and I have no idea what to do. She keeps trying to contact me constantly saying it’s all MY fault.
but they were separated!!! She knew this!!!
My partners ex is causing us problems?
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