I broke up with him and he says he misses me?

I posted how I felt on Twitter one night. We haven't talked for 3 weeks and in the morning I got a text and it said, I'm just letting you know, I know you treated me good and I acknowledge that. I said, thank you for noticing something positive, have a nice day! and he said good luck and I haven't replied since. 
But the other day him at his new job in my town yesterday and he saw me. Why couldn't he just stay in his own town? I was happy, smiling and giggling with my mom and we left. I posted on my Twitter, that was unexpected but I'm glad... good for you. Meaning I'm glad he finally got a job. A few hours later he posted on his Twitter, missin you girl. And deleted it. Only to post, I'm missing you girl, a couple hours later. Then he posts, oh it seems to me... that sorry seems to be the hardest word. 
What does this mean? I'm so confused.