Ah! it is well for the unfortunate to be resigned,
but for the guilty there is no peace.
I excel at feeling guilty. It is one of the emotions I have really perfected. My own special recipe consists of one part fear, two parts remorse, and two parts shame. You let that settle in your gut for a few minutes (may five or six) and then you add a nice thick layer of anxiety and compulsive thinking about how whoever you've done wrong will likely hate you forever.
Now, you'll feel tempted to rush this next step, but you must resist the urge to speed things up because this next part is critical. NO MATTER WHAT YOU DO, do not actually try to make contact with the aggrieved party. The aggrieved party will probably have no idea that they've even been aggrieved. The aggrieved party will probably not even know what you're talking about. And then where will you be? You'll have to explain why the aggrieved party should be aggrieved, and, believe me, nothing good can come of that.
No. Here's what you do: You stew on your guilt for maybe a couple of weeks. You obsess on it. You really get good and compulsive. Then, just when you can feel the leathery snake scales growing on your skin, you go and eat everything in your refrigerator. Thus fortified, you invite the aggrieved party to coffee or breakfast, but right when they get there you feign an "emergency" and flee the scene as fast as possible. Now, the aggrieved party will feel so bad about your "emergency" that they will only feel sorry for you. And you can just make it a point to never have to see that aggrieved party ever again for the rest of your life. And bingo! Everyone's happy (with the slight exception of the small tic you may develop in your right eye, but, hey, in some societies tics are considered incredibly sexy so, really, it's still all good.)
So the next time you skip out on a friend and leave them footing the bill and surrounded by a bunch of depressed strangers, just remember, Guilt! It's what for dinner!