Don't dump him if you can't put down your face. If he wants to pay you back, you can't tell. If he thinks too much, call him.
You are four years older than him, and you won't take advantage of him, but adults always prefer younger ones, so if you really want to hit him, you must follow the following points.
First of all, you must have a convincing reason not to make it up.
Second, if you hit him, it will definitely make him want to cry. Don't worry at this time, drag him to find an adult, he will be in a hurry. At this time, your purpose will be successful, and he will not dare to look for you next time even if he has the courage.
Third, this is harsh. You can't hit him where his skin is exposed, or it will make him look miserable. If possible, you can grab his arm and twist it behind his back so that he can't move, provided that you fight him, he is not as good as you.