A lesson I learned from a sales friend of mine (often the hard way): if you really want to say no, don't give reasons why you're saying no. Just simply say "no, sorry" Once you start giving your reasoning, the other side can negotiate a compromise or attempt to persuade you into thinking your no is a bad idea. The more information you provide, the more they can use it against you. If you don't have time for that, jus…
You also have to watch for the attempt to extract a reason from you. Sometimes it'll be a bald "why not?" but sometimes it's more subtle like "Oh, spending more time with the family, huh?" trying to leave you socially obligated to affirm, deny, or correct it. I find a very neutral "mmmm" to be a pretty good disengagement; you clearly heard them, but it doesn't affirm, deny, correct, or really leave any opening for th…
Prying is socially hostile and should be responded to as such.
In certain cases of ongoing, and contentious, relationships, sooner.