Why would she want to block me and what should I do?

My ex who i was still sleeping with told me recently he had a girlfriend. I texted him one day and he blocked me. So I called him from no caller id. He called me back and didn't mention the real reason why he blocked me but we were talking about normal stuff. The second time we talked he told me he blocked me because he has a new girlfriend and she told him to block me. I dont know her. He still calls me but won't unblock me.

Why would she want to block me and what should I do?
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