Encounter With A Friend?

I'm just seeking comments / discussion about an experience that I had. I've never talked about it before, but I have become curious about what happened and would be interested in other people's thoughts.

When I was 18, one year out of high school, one of my friends who was in the same grade as me committed suicide. I felt like I had not done my best to stop the situation, as I knew he was depressed and having suicidal thoughts. We were quite close, but I had become uneasy around him after high school.

Anyway, I was quite badly affected by his death, feeling somewhat responsible. I thought about him every day for a long time after. On the one-year anniversary of his death, I lit a candle in my room, for remembrance. I broke down in tears, apologizing to him continually for not being a good friend, and asked for a sign that he understood my side of things, and perhaps forgive me. I focused on the lighter I had used to light the candle, continually asking for a sign. After about a minute or so, the lighter moved about an inch across my desk. I was scared but somewhat at ease. I said out loud that I'd never ask him for a sign again, partly because I was so scared of what had happened.

Since then I've never seen any more signs and only 'talk to him' out loud on occasion.

Just wondering what everyone thinks of what happened. Is it possible that someone who had just gone a year before this could show a sign like this? I'm not sure.