I'm not going to message my friend first anymore.
Why do you want to cease contact with him?
Because I don't want to talk to him so frequently. If he messages me, I will message him back after two days.
Wanting a little space is not a bad thing.  Just because you're friends doesn't mean you need to get back to him immediately.  That's totally fine!
I just don't like how often he is always messaging me.
It sounds like taking a little space from him is the right thing for you. Who knows, maybe after a little break you'll be happy to message him more often.