Abandoning games happens all the time; honestly it would have been easier to just say 'yes I got bored of the concept'. No one would have faulted you for that. People move on, that happens, that is normal behavior. Now when it comes to faulting...

Do not push the blame on inactivity of the players when you were inactive here. There were steps you could have easily done instead of just letting us wait in the dark. If I might offer a quick suggestion on 'what steps could have been taken'; I would have gave a couple of pings to everyone, it would have been a visible way to indicate that 'no I did not abandon this' which it appeared to be when you did not offer anything, either IC or OOC to explain the status of this game. 

Instead from all accounts of the signs, you just left it in the dark to rot. Communication is important, and frankly you failed to properly to your players.