He blocked me because of his ex…what do I do?

We established a good friendship over 6 years and just started dating. His ex found out somehow popped out of nowhere and started emotionally abusing him. He said that she’s the kind of person who can harm me in some way and to protect me he is going to cut off contact before she does something. My cousin knows her and confirmed that it’s true, she’s not mentally sane. So he blocked me. We can’t communicate until she’s out of the picture. Do I just sit back and wait or take some more serious measures? Is getting the police involved a drastic step?
He blocked me because of his ex…what do I do?
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