Hello, as u
I think I know what the problem is. It's all about her. She thinks about only herself. I probably would have given her the pink slip a long time ago.
I think it's a good idea to only do favors that you don't expect reciprocated...or only spend money that you can afford to lose "helping" a friend.
How about asking her about it next time you see her? Say something light like "hey, I thought that you were taking me with you the next time you went West" and see what she says. Maybe she forgot what she said two years ago. If she then invited you, would you be satisfied and go along?
If your generosity is not reciprocated and you start feeling used then its time to do something. Decide if it feels worse to be ungenerous with her or to always be the giver. Think about whether she "gives" to you in non-monetary ways that might make up for it. And you can always have a frank discussion with her about how you're feeling even though that may make the friendship feel tense and awkward for both of you, or it may clear the air.
I would ask her why she hasn't invited you, since she said she would. She sounds like a "taker". "Takers" always seem to hook up with "givers". She sounds like the kind of friend who's always around as long as you're giving.
Except for loaning money (which I NEVER do) I have had this issue sometimes. I find that I am giving and never getting anything back.
I think you should express your feeling and don´t bottle them up for any relationship.
I´d tell her more or less what you said here.
Two years ago, she promised that when she next visited her family out West, she would invite me to go with her.