I ran into my ex today. Is there a chance he will contact me?

So I ran into my ex boyfriend today, and it was a bit awkward at first. He broke up with me about 6 months ago, but we haven't seen each other in almost 3 months. We were texting back and forth for a while, then he just stopped responding, he says because he was "busy and didn't feel like talking". Deep down, I was always hoping I would run into him just so that he could see me again. There's always that bit of hope that he'll "come around". I text him a few hours later saying it was nice to see him, and that he looked good. I swore to myself I wouldn't, but my weakness took over. Of course, he didn't respond. I'm disappointed. Should I just let all of this go as coincidence? Or is it a sign? Comments appreciated, but please be nice. I still have feelings for him. Thanks