Agreed - that isn't on you. You might be taking a bit too much responsibility for this.
Have you spoken to her since you broke up?
Maybe she's married by now, or maybe she just doesn't want marriage. Maybe she doesn't regret the time she spent with you or blame you for anything. Maybe she's out living her life and assuming you're out living yours, not torturing yourself because you're imagining you've hurt her.
I don't know about the cultural side of where you are, but people come and go, relationships start, and end.
It's no reason to hurt yourself - in any way. Maybe if you spoke to her you could resolve it?
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Alexithymia - 147 points.
Low-Verbal.