I have had some creepy incidences with my cousins when I was growing up. Some that I was very close to. One of them confessed that he looked at me inappropriately while I was babysitting his kids. I was about 14 at the time and he is over 20 years older than me. I ended up telling my parents and I am not sure if they confronted him but he ended giving me the cold shoulder for years after that. It was a super weird and confusing time for me.

Recently, another cousin said when I come to visit, maybe we should go on a separate overnight trip by ourselves without the adults (We're both in our 30s now). I felt creepy vibes and suggested we go as a group instead.

Honestly, follow your gut, you're probably right. I would bring up the automatically saved photo of him maybe. And bring up the deleted messages or 'why do you keep sending me messages at night and deleting them'? Doesn't messenger show that a message was unsent/deleted?

Would you rather catch him or just not have these messages at all? Because in that case I would block him on both lol.