1. Make sure if his behaviors have offended you
Compared with a mature relationship, this situation is rarer in a complicated relationship. However, it is possible for you to meet someone who will abuse you and harm you. As we all know, NSA relationships are aimed to help casual encounters look for sexual pleasure and have nothing to do with emotions and other deeper things. For example, if your friend requires to do take on the responsibilities of a girlfriend and is reluctant to entitle you, his behaviors equal to take control of you emotionally. At that time, thinking about whether you should leave is a right choice. According to the negative influences your friend exerts on you, you can list leaving him in your agenda. When you are going to leave, tell him the reason why you choose to leave. No apology, no hesitation and no rethought of your choice because you deserve a better one.
2. Don’t deceive him if he is your good friend
Though it may not be a totally romantic tinder free relationship, it is a relationship. And your FWB still deserves an honest friend. If you think this sex relationship is not what you want and you want to change this situation, you should tell him first of all. Pay attention to your diction to avoid hurting him. Try to explain the reasons sincerely and express your wish that hoping you can proceed to be good friends. If you think such an action is superfluous, there is no need for you to do it in person. But you still need to say something. Maybe one text is enough. This is about respect.
3. Try to dwindle sex before you break it off
More often you have sex with your friend, more difficult for you to cut it off. It will exert bad influence on your friend if you break sex off in a sudden under your friend’s unawareness. Thus, to make a happy end, a less harmful ending at least, you had better taper off sex before you break it off completely. In this way, you can alienate your friend away from you gradually, both physically and psychologically.