Should I message him?

I’ve hooked up with this guy since December we’ve met four times and we’ve slept together each time. We snapchat every now again some days more than others. Normally I’ll send a snap and he’ll reply and a conversation starts but he doesn’t snap me. He’s had exams and he finishes tomorrow should I message him the day after or should I wait for him to message me? I know it’s a bit obsessive but his snap score doesn’t really go up so I presume he doesn’t snap anyone at all.

I don’t know if I should reach out to him in a couple of days or wait for him. I just don’t want to look clingy or invested and then be rejected. The last time I saw him was on Sunday and that was after a month of not seeing each other.