How do I get over feeling guilty that my ex is sad over our breakup?

I broke up with my kids father because he was verbally abusive and never changed, he even pushed me out of anger 4 times but this last time he really hurt me. He always claim he would change but never did. I feel so guilty & bad because he keeps crying sending me million of texts that he’s going to try to become a better man. I feel bad because he is really heartbroken & said he never did anything intentionally it was a mistake he regrets I don't know what to do. I forsure want to end things this time because I know it’s not going to be different.
How do I get over feeling guilty that my ex is sad over our breakup?
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