Quoting 2ndontheway:" Talking with my DH about it at the moment and he basically said the same thing, "you find out who your ... [snip!] ... they just don't feel it's important. Makes me feel like I wasted a lot of time investing in my relationships with some of them."
It's true. You find out who your real friends are & who is worth your time. & then next time they want you to go to something you can either 1.) be the bigger person and go 2.) still go and then say something about your shower, not directly but say something like, "oh, how was that garage sale you went to?" or something. That way they know you know the real reason they didn't come (my mom is great at doing that to people) or 3.) don't go
My mom's friend that she has been friends with since middle school didn't come to my wedding shower and my mom was pissed because she didn't RSVP either and didn't give a good reason (I forget what the reason was), and my mom goes to ALL of her parties and stuff for her kids, she was LIVID. I just told her, "well now you know how much of a friend she really is"