Why won't my friend block his crazy ex gfs number?

I like my friend and I want to start a relationship. He says he's done with his ex girlfriend though. He dumped her. She still blows up his phone, and she still loves him but he won't block her. He sometimes doesn't reply, sometimes says "stop talking to me" or "can't talk" but won't block her. I don't understand. Why won't he just block her so he's not bothered? Do I have a chance?
Updates:
+1 y
is he not done with her
Why won't my friend block his crazy ex gfs number?
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