Found out he messaged girls different times with sexual talk and inviting them over, what should I do?

I've known him for 9 years and been talking, hooking up and such for almost a year.

Recently I happened to see this post that he did asking for advice in regards to a girl he hooked up with before and how he wants to lead her to another night together but also give her "free will" (choice)? And invited her over to "touch each other" but she was unable to go that night.

Another post was months ago where he asked advice for "maybe response" to a girl that said she will keep him in a book of maybes. I am unsure if these girls ended up going over and they did things but these posts are major red flags.

Any advice? What should I do? I known him for what seems like a lifetime but this is not a side of him I thought I'd ever have to go through and deal with.

Found out he messaged girls different times with sexual talk and inviting them over, what should I do?
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