I texted my ex-bf to tell him to stay away from me but i don't want to read his reply?

I texted my ex-bf to tell him to stay away from me but i don't want to read his reply. If i block his number, can he still read the text i sent before i block him?

Added (1). I texted my ex-bf to tell him to stay away from me but i don't want to read his reply. If i block his number on my iphone, can he still read the text i sent before i block him?

He'll get it for sure because blocking a number only stops communication once you blocked him