First, accept that it's his loss. From the stories we've heard, it's often the guy's issue, not yours. For example, in the story where the guy stopped replying after months of dating, the girl eventually realized she was better off without someone so flaky. Just move on and focus on yourself.
One of my friend's stories is that she was dating a guy for a couple of months. They texted every day and went on dates regularly. Then suddenly, the guy just stopped replying to her messages and calls. No explanation at all. It was really tough on her as she had started to develop strong feelings for him.
It could mean he's still curious about you. Maybe he's not fully over whatever connection you had, but he's too afraid or unsure to reach out directly.
It could mean he's still curious about you. Maybe he has some lingering interest or he's just being nosy. He might be having second thoughts about ghosting you.
I once had a boyfriend who just disappeared. One day he was there, texting and calling, and the next day, nothing. No explanation, no goodbye. It was really tough because I was left with so many unanswered questions. I kept wondering if I had done something wrong.