I don't have this person added on fb but...?

[🙊mimi]

I'm talking to this person but I unadded him on facebook (personal reasons) and he keeps messaging me but he says Facebook is sending him notifications saying that he's harassing me since I have him unadded and he keeps sending me messages and that I should add him again so his account doesn't get frozen....is this possible for facebook to do this? Does facebook even send out these notifications?
Hes not actually harassing me just I can't have him added on fb for personal reasons