Why do good girls go bad after a break up?

james0000
3 year relationship with girl, I am her first boyfriend.
She wants the relationship to progress, I just want to chill out.. I have a bit of a fear to commit.
Mutually agree to break up, because she was unhappy. Love and respect her a lot, gives me time to think. And she says she wants to look for a more serious relationship.
She asks if we can still be friends, but she doesn't want to see me because its "too difficult"
I respect her.
After break up, Tell her every day I love her, and ask her how she is.

I notice and from mutual friends I hear she is partying a lot, on every dating app, going on dates etc.

It hurts me deep inside, but I still try to respect her because I feel like a jackass for not wanting to progress our relationship.

After 2 weeks I break down, I miss her lots.

I want to marry her, start pursuing her.

first subtly, then she starts rejecting me. I am confused, confess my feelings and undying love for her.
She says she is not sure I am honest with her. I tell her I am. Try to prove it.

She strings me along, keeps dating other men, partying etc. I am slowly going insane. Pursue even harder to prove I am dead serious about her, also I am scared she starts sleeping around.

She notices how much I love her, she keeps me in the friend zone.
While she is dating other men.
hurts a lot.

This goes on for 3 months where she grows more and more distant, and I grow more and more obsessed with her and depressed because nothing seems to work.

she says there is nobody else

Eventually I hear she was sleeping around, she knew I would resent her for that. However she keeps on doing it and she doesn't care nor respect me at all any more.
She says I am a closed chapter.

I am devastated.

How could a woman do this? She used to be head over heels for me, she said she was looking for a serious relationship, I told her I wanted to give that to her 2 weeks after we broke up.
Why would she string me along while sleeping around like that?
Why didn't she just come back?
Why do good girls go bad after a break up?
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