Why is my ex so bitter towards me even though he broke up with me?

Anonymous
We had a pretty good relationship, he often told me how happy I made him. When he broke up with me he did tell me that he wasn't sure "if I did a good thing or if I just made a big mistake"... we did break up for a stupid reason... I've been a good ex... i haven't been hounding him apart from the first few days when i begged him to reconsider...
Why is my ex so bitter towards me even though he broke up with me?
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