Here's an extreme, all emcompassing, automatically-negative-thought: I almost always regret getting to know people. It's true. I have realized that I have a good, core group of friends that were established years ago and the older I get the less friends I gain that fall into the good, core status. There have been maybe two in four years.
So if you have recently become an acquaintance of mine, don't take offense to this statement. If we're still communicating in some way I don't yet regret getting to know you :) We might not end up BFFs but more than likely we'll continue to be friends/acquaintances and the rest of the post won't apply to you.
Maybe I should soften my statement to: I almost always regret getting to know people because typically they just end up being lunatics that you have to nicely avoid later (or maybe not nicely, in some situations). It makes situations like this, with seemingly normal new acquaintances, awkward:
New acquaintance: "Well, this was fun! We like a lot of the same stuff....we should hang out again."
This sounds fun and promising but experience has taught me that when/if we hang out again more than likely this person will be a total contradiction, a weirdo, or clingy. Very rarely does making new friends in your late 20s work out like it did in elementary school. "We have the same favorite color! Yeah!" BFFs for life! or at least through the school year. So I automatically resort to vague, conservative answers, such as:
Me: "Yes, it was fun. It would be cool to hang out again....someday. Gosh, but when? We're both so busy....." In my head this statement actually sounds like this: "MLEHHHHHHHH. Too.Much.Effort. Just to be disappointed. Mleh again."
I know I sound mean, but really I'm not. I'm extremely frustrated that people waste one another's time pretending to be awesome and then turning out to be cuh-razy. This is frustrating mainly because I end up being the person who has to "break up" with that person and it usually effects me recreationally---well, can't go there anymore. Gotta switch my schedule a bit to avoid the crazies. . .possibly change my number and quit my job. Mleh.