How to address this?

So I have been talking for a while. I have met his friends, we are really close, and we have both openly said that we want to date. However, during our talking phase I told him that I don’t like when guys follow an insane amount of girls online (especially ones that they doesn’t really know or ones that don’t follow them back). To me it is just disrespectful and shows that they do not value the person they are with. Anyways, how do I tell him that if he wants to date me he needs to change that?
How to address this?
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