For confused people:
They're my girlfriend now (we're the same age don't worry guys) and basically he was this user's ex when they were 11/12 and he was 17. He didn't try to do anything sexual, but I do understand the age gap is weird. They consented to dating him and the two had no inappropriate interactions, so there's not much we can do, as they never did anything sexual or really wrong. Hope that helps ^^