Aww I'm sorry sweety, I really am. I'm sure they meant every word they said at the time, but when things got difficult, they couldn't handle it for some personal reason and changed their minds and went against their word. That's called immaturity honey.
A few will feel bad about themselves, and a few wouldn't be bothered about it. To find that one true friend that sticks with you through thick and thin is a rarity and a blessing, and they are out there. Just got to find them. Keep in mind, as your'e looking for them, they are looking for you, too.
I hope you get to feeling better sweety.