Girls, what's the best way to apologize to an ex for calling her names?

Anonymous
When we broke up I got very angry and called her ugly, fat, a bitch and a bunch of other things I didn't mean. Later I heard she was extremely upset from the name calling. It's a few months later and I want to tell her I am sorry. How to approach this?
Girls, what's the best way to apologize to an ex for calling her names?
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