Break Up & Divorce

I Lowkey Miss My Ex-Girlfriend, what could I do to let her know or get her back without seeming like "That Ex"?

What should I say or do to get her back? by the way im the one who broke up with her. I Miss her & think about her a lot and she's still single from what I know so yea. But we did recently get into an argument but it was almost like we enjoyed it' if that makes sense? And it's only been 3 days since the break up.
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But what should I do if she doesn't miss me back?
I Lowkey Miss My Ex-Girlfriend, what could I do to let her know or get her back without seeming like "That Ex"?
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