Why do I feel bad about my decision?

So I broke up with my boyfriend a few weeks ago due to his inconsistencies and unable to do the bare minimum. I have had conversations about this beforehand and how it made me feel but all he did was apologize. After being fed up with my feelings being hurt I broke it off. Now weeks later I miss him and feeling like I didn’t do the right thing…
Why do I feel bad about my decision?
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