I sometimes lead on girls I'm not interested in
Why do you lead on girls that you are not interested in?
It's fun to see the look on their face when I don't say yes
You shouldn't lead people on intentionally, it's cruel. You will get a bad reputation among your peers if you continue to do so. People won't want to date you at all if they know of your behavior.
I'm going to lead on people because it's fun.
It's fun for you, and I can see that it gives you an ego boost. I suppose every guy likes the idea of being wanted by girls. But don't you think it's a waste of time for you because, at the end of the day, you don't actually have a physical girl to love and have a great relationship with.