I need advice!

Samantha
So I just started dating this guy and suddenly this girl comes out of nowhere, messenginv me on Instagram, basically telling me to "back off her boyfriend" and calling me a whore and things of that nature. 
I talked to him about it, he tells me it's his psycho ex girlfriend, and not to worry about her, just ignore her. So I did. I blocked her and everything. 
A while months later, This morning I wake up to a message from her on Facebook saying  "I thought I told you to back off my boyfriend you slut" and a few other nasty things.
Again, I bring it up to him and I told him he needs to shut her down I don't want this drama, and he says he's going to Handel it. 
But who do I trust? This brand new boyfriend, or this clearly upset (or psychotic )woman. 

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