I have moved around a few times and lost contact with friends over the years. I've never been that confident in friendships and always feel like I like people more that they like me. IYSWIM.
About three years ago I met Z and we have become firm friends over the years. Z says I am one of her best friends.
However, Z had a birthday recently and went out with at least three other couples (fair enough, she is a popular person) Anyway i wasn't bothered about not being invited but she lied to me and told me she was just going out with 1 other set of friends.
We meet up all the time during the day. We often meet at night, however its always at mine and she will let me know on the day (usually) wether she can come or not (????)
I am really stating to wonder if she meets up with us if her and Dh have no better offers. 
I think there is something wrong with me. I can't keep friendships.