In between marriages, over the course of a year or two, my standard answer to almost every invitation was "Why Not?"

Coming to Melbourne for the weekend? Why Not? (Even though I'd just spent a hundred bucks or so on a plane flight from there earlier that day! So what?)

Want to go out for Italian? Why not? (I haven't eaten Spaghetti Marinara for a long time.)

Want to go to the movies? Why not? (Never seen that actor before. He might be good.)

It's a remarkably freeing mindset. And you end up doing so many unexpected things. And meeting new people.