He ghosted me after being nice to him?

After sitting next to him (he was nervous, always staring, and always close), I wanted to break the ice. But the next day, he didn't sit next to me as expected, despite having free chairs, and mine was free too (we take the same train). I don't understand why he stared for 2 months, and then when I tried to give him hints, he treated me this way. It was obvious he was into me; he was watching what I was doing every time we met, which convinced me that there was something between us. This is making me sad, to be honest.

Updates
+1 y
no answers?
He ghosted me after being nice to him?
Post Opinion