Do you think I should lead my ex on so that I can break his heart like he broke mine
That would depend on what you are trying to do. How do you plan on leading him on?
By taking him out on a date and to a movie.
You shouldn't lead people on for revenge. It's petty and makes you look childish.
I want to lead him on so that I can drop it and make him look like a fool in front of everyone.
It's not a good idea, I think, because he should not deserve anymore of your precious time. You don't need to lead him just to get revenge. You need to find a good man and post your relationship on social media for him to see what a good life you have.