My ex is being really clingy after break up

So we were in a 5 month relationship and i ended it because we were both at different stages in our life and i didn't love him as much as i thought i did. We ended on a good note because i didn't want to hurt him too much so i just lied and said that the reason was that i'm going to university and i won't be coming home for ages.

He finally accepted it but was so committed for it to work he TOLD me that he's gonna move to liverpool with me which made me panic and finally i convinced him to stay. But now i told him that i need space and we shouldn't talk for a while, but i know he stalks me on social media and realises when i haven't been on it for a while & then messages me 'hope youre okay', i can't bring myself to delete or unfollow him on social media because it'll hurt him more but although we're not talking i know its hit him hard but he's still constantly there. My plan was just to wait til september when i start uni to distant myself more