My ex (21M) asked for a second chance and I (20F) feel like he might ghost me. Should I block him, cancel the meet up, or wait?

A couple days ago I broke up with my boyfriend because he kept showing signs of emotional immaturity. He would read emails while we had serious conversations about how his behaviours were hurting me, dismissed my feelings, and acted like he was too busy for any emotional labor. I didn’t feel heard, or prioritized.

Only after I sent all his belongings to him (2 days ago), he sent me a long message apologizing and asking for another chance. He said he couldn’t let things end like that, that he wanted to talk, that he cared, etc. I asked him to send my belongings to me anyway and agreed to meet up tomorrow and told myself I’d write out a list of what I’d need from him if we ever considered trying again.

Now here’s the kicker: Since agreeing to talk, he hasn’t messaged me once. He unfollowed me on Instagram. Removed me as a friend on chess dot com (???). Didn’t say a single word about whether we’re still meeting tomorrow. And when he couriered my stuff back to me, I found somebody else’s hair clip in the bag.

So now I’m sitting here wondering:
Should I just ghost him?
Should I just send a message saying “don’t bother, I don’t want to meet anymore”?
Or do I wait to see if he actually reaches out tomorrow like he said he would?

Part of me feels like I’m being disrespected again and giving him the benefit of the doubt again, when he’s already showing me who he is.

Do I wait it out or shut it down?

TLDR:
Ex asked for another chance and asked to meet. I agreed, but now he’s silent, unfollowed me, and returned my stuff with someone else’s hair clip in it. Should I cancel the meetup or wait?