What happens to the addEventListener when I remove node?

I generate objects dynamically, and when they are created, I add click event listener to them:

let elements = document.getElementsByClassName("my-class")

for (let element of elements) {
    element.addEventListener('click', function() {
        // here I do my job
    }, false)
}

After that, some objects may be deleted by the user. I take them off with this method:

element.remove()

And now I want to understand what happens next:

• Does this listener still exist? I hope that listeners became 1 less. But how to check it?
• Do I really need to worry about the large number of listeners? how large a number of listeners can become a problem? I’m afraid my app will break.