Normal or not , it’s clearly not ok with you and he should be considerate enough to sense that.
You need to talk. Most relationships fail because the communication fails. So tell him what’s bothering him.
If he doesn’t want to stop, start looking a hunks on tiktok yourself. While he sees.

i keep tiktok videos of girls i find cute on my phone Lol
It's nothing to feel insecure about. You can find strangers attractive...as long as it doesn't lead to anything. Same with you!
But tbh, you guys define your own boundaries..so its really up to u guys. But if i were u, i would allow some freedom on this. he will feel smothered if u make him delete them

I don't think that's normal. Ask him why he needs to save them on his phone and would he mind if it were the other way round? Talk with him.

Young men are not always mature enough to realise how their actions are perceived by others

Are they like nude videos

Micromanagement is always bad. He is a free human

What do you mean keep? Does he look at your videos?

It's inconsiderate of him, to say the least

Drop him. Social media ruins everything