I feel like leading a guy on
Why would you want to do that to him?
It's fun to watch other people suffer.
It's totally unacceptable to pretend you're interested in someone romantically when you really aren't. Doing that could really make them feel terrible. It's better to be honest with someone if you don't have feelings for them.
Oh well. I thought you were supposed to always keep an open mind and stuff. At least I tried to lead him on, right?
You don't get anything for leading him on, so stop doing it.