Isolating ex girlfriend from enviroment normal?

My ex boyfriend emotionally blackmails common friends to not spend time with me or demands to end the friendhip. The breakup is 1,5 years ago and he has a new girlfriend and he had her for quite some time now. What the hell? What does that even mean? He ended the relationship with me. What are your ideas about it.. do you think this is normal? I would never do that to my friends. I think it is abuse. What do you guys think?
Isolating ex girlfriend from enviroment normal?
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