friend sent my ex girlfriend "pics"

for context on the situation, my ex girlfriend and i had dated since april 2024 and broke up recently. we still talk often and are on good terms. my friend, same age as me a few months ago asked me if i could send him my girl's (at the time) nudes. i obviously declined his disgusting request and told her about his inquiry. she was also disgusted and told me how she hated him. a few days later he goes and adds her on snap. we decided she should add him back so that we could like mess with him to see what he would try. he started off snapping her like a weird angle of his shoulder, flexing it as hard as possible in attempts to seem muscular. we both laughed about the ridiculousness of the situation and thought not much of it. fast forward to last night, my girl and i were bored and decided to snap him again. they snapped back i he ended up saying "wyd" in one of the snaps. she told him nothing and he responded by saying "im bout to take a shower" we decided to mess with him and say "without me??" cus we thought it was funny. he tried to escalate things from there and ended up sending multiple videos of him playing with his tiny penis 😭 i opened all the snaps so my ex girl wouldn't see them but i was just shocked how casually he was doing this and he knows this is the only girl i've ever loved and that i care about more than anything. before anyone says anything about my girl like secretly liking him like that i guarantee you she does not one bit. we were both disgusted the entire time he was doing this and did NOT enjoy his actions one bit. me and this guy's families are friends and have been for maybe 5 years or so. what should i do about it? he's going to be invited to friends events and he is part of my friend group so i don't know what to do about it. i'm honestly just so disgusted by him and the things he's done. anyone got suggestions on if i should tell him know what he did or not ??