Would it be a bad or good idea to apologize to my ex? Should I?

He’s helped me out with things financially even though we broke up & we got into an argument over something small & We we’re going at it out of anger from the past and saying things we didn’t mean. I told him to die and I called him a crack head baby since his dad does crack :/. And he’s never blocked me in our relationship or after we broke up but this time he did. He has a girlfriend too so I don’t want to interfere I would just like to apologize because deep down I know that’s not how I am.
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