Is this reaction normal if the girl was a virgin and he dumps her?

Anonymous
My older sister (she's currently 25 years old) has been secretly stalking her ex boyfriend at his workplace.

She was dating him for several years, he promised her a future and family. Then he ditched her because she wasn't as successful as him and then admitted he never wanted to marry her, that it was just to say what she wanted to hear. He blocked her after she send him a ''I gave you my gift you fool. I hate you. If I can't have you, no one else can. NO ONE''.

My sister has become kind of obsessed with him. Since she gave up her virginity at age 19, she's focused on him. She claims to still love him but it seems like she sees him as an object of possession. She keeps saying she'll find ways for him to return to her. She has saved his personal information and locations.

If a girl had her very first heartbreak ever and it was her first... is that reaction normal at all?
Is this reaction normal if the girl was a virgin and he dumps her?
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