My ex-gf broke my heart! Was she trying to apologize? Should I give her the time of day?

My ex-girlfriend absolutely broke my heart, right before I was going to propose. She pulled the rug right out from underneath me, and then started dating an acquaintance of mine less than two months later. This was just one of many things she did after we broke up that hurt me. I recently sat down with her, and she attempted to tell me that she didn't mean to hurt me by dating someone so soon. Somehow, I don't really believe her. I think she's just trying to clear her conscience so she can move on. I'm afraid I let her off the hook. I told her it didn't matter anymore, but definitely showed that I was kind of upset. There's so much I want to say to her. I want to tell her exactly how she hurt me, and why it hurt so bad. I don't think she has any idea the extent of my pain.

Should I attempt to tell her specifically what she did that hurt so bad?

Is she just trying to clear her conscience?

What's the best way to make a girl think twice about dumping you? How could I drive her crazy? Is being cold and unaffected really the best way to handle this?

I guess I'm just afraid that I should have taken the opportunity to have a discussion with her when she tried to apologize. Instead, I let it pass. I'm kind of sad that I didn't talk to her about it.

What do you wonderful folks think?
My ex-gf broke my heart! Was she trying to apologize? Should I give her the time of day?
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