OP, I appreciate he initiated the conversation whilst he was away, however his last message in my eyes shows he was done talking.
Leave him to it and let him contact you, otherwise you come off as super needy if you send him inane ‘breezy’ text messages.
If you want him to miss you, then don’t go chasing him. Make yourself less available to him.
You’re sitting there wondering about him, but do you think he’s sitting there wondering what you’re up to? I’m guessing not. So go have fun with your friends.
Although given what you’ve said about why you broke up with him, I’m struggling to see why you’d want to get back with this guy in all honesty. How much could he have possibly changed in such a short period of time?
You’ve already stated you’re the one who generally initiates conversations with him. If he wanted to be with you, he wouldn’t constantly wait for you to contact him, he’d be contacting you himself.
Lots of red flags waving all over the shop here for me. I think you can do better. Firstly, love and respect yourself more. Then go find yourself someone who actually makes an effort to be with you.