I agree too. I like the idea of the note though like Skeezyks said. It will probably help with some closure for him, so he doesn't feel like you ditched him for no reason. People can be really hurt by not knowing what happened when a person decides to end things. I know, because it has happened to me so many times.

I suggested a note, because a phone call would be too scary, hell, even for me. I am not good with confrontation, and I am probably a coward in that regard, but I am definitely not heartless, and I know neither are you.

You're doing the right thing either way by not leading him on.