Less sex
It's very painful to be forced to leave a relationship when you're unprepared. So, when you really want to end this relationship, you need to send a corresponding signal to your friends. In this way, at the end of the relationship, he will not be surprised and frightened. In fact, it's a good idea to try to reduce the number of sex before the relationship ends. This will open up the distance between you and make your connection less intimate. This will make it easier for your relationship to end.
Be honest
Whether it's in an NSA relationship or after that, you're still friends. So he deserves your honesty. If your friend wants to know why you ended the relationship, be honest with him. This doesn't mean you need to ask for his forgiveness or consent, but it will reduce unnecessary troubles. It's an effective way to make sure you're still friends after you break up. Remember, if your friend is trying to change your mind or give you a promise, don't get caught up in it. You need to be firm about what you want and what you think.
Confirm to your friends that you are still friends
An NSA relationship can easily destroy a friendship. Even if the friendship is strong, this casual dating relationship will have more or less influence on it. So, when you decide to end the relationship, you need to try to convince your friends that you are still friends even if your relationship ends. The relationship is short, but you enjoy it. But now it's time for you to end the relationship because you have other plans.
Accept bad results
If hookup finders can end this NSA relationship amicably, then some people can't, such as your friends are not willing to cooperate with you. Whether your friend feels betrayed or doesn't want to leave the relationship for some reason, your decision really affects the friendship between you. No matter what the result is, you should accept it calmly, and don't force them to change their ideas and feelings about it.