You don’t have to give him an involved explanation -- "My needs for a relationship have changed since we first began dating" may suffice. Give him the opportunity to share his feelings about the relationship ending, so long as he does so in a respectful way.
Or maybe you’re moving to another part of the city and just don’t think the sex is worth the commute (extremely fair). Is FWB more out of convenience than actual pleasure or fun? Do you see them so rarely that it’s not even worth telling your new SO, or telling them that you have a new exclusive person in your life?And you can move on to the next phase of your life knowing you did the right thing.The fadeaway, a dating move in which you abruptly cut off communication with someone without explanation, is unequivocally rude…but often tempting. But you’re wrong about people being able to take hints.Perhaps we don't know the words to use, or find that even communicating a rejection over text is too awkward.As I wrote earlier this year in an essay on the ethics of the fadeaway, I’d rather a guy text me "hi im done w/ u, boning my ex now" than inexplicably stop responding to all of my totally adorable conversation starters and late-night propositions.