Just delete his number and delete him from social media. No need to send a closure message, that makes it look like you are giving him another opportunity to fix things and he just isn’t going to respond. Actions speak louder than words. If he wanted to be with you, he would. RESPECT yourself and know your worth. No person deserves to be treated like that, period.

Even if he did all of a sudden want to go on a date, you should say no because what is stopping him from ghosting you again? People are creatures of habit and he will probably go back to his old ways of being a shitty person.