you can not

When a girl no longer wants to see you, she will miss you. You do not appear on the homepage anymore.
When a girl does not want to hear you add anything, she will block all your phone numbers, messages from you. So you can not call, can not explain any words.
And when a girl wants to completely erase you from her world, she will block all communication, blocking all.
So you can not see her, can not talk to her, know nothing about her anymore.
Accordingly, she too, know nothing about you anymore.