Flirting

How often should I reach out to him?

So I have a friend? Who is an ex well not really it was a situationship, 10 years ago.
I’m getting to know him again. I said sorry for hurting him and he was great in my life.
But we really haven’t had a fun conversation without deep and meaningful.
How can I make the conversation more playful and not so serious?
How often should I reach out to him?
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