Having a friend treat you shabbily is really tough, having two friends do that is even worse.
You sound like a very mature young lady, and realize that although friends are important, they do not have the right to treat you unkindly, just because they think they can.
It sounds like your freind was posturing for her new friends, adn she was using yu as the prop, imply because she felt safe doing so, as she felt that you would not retaliate and hurt her.
Know what hun, every relationship, and mean ALL relationships need good communication to grow and be healthy for every one. Furthermore, the communication needs to be honest.
What that means is you have to tell Monique how you honestly feel when she treats you roughly, adn although you treasure her as a friend, having her hurt your feelings really makes it dificult to be happy around her.
It would also seem that you and Riley are in the same leaky boat, you both felt it necassary to go back to the friends that treated you badly.
In any event if you wish to continue your friendhip with Monique, talk to her, if she is truely your Heart freind, she will listen and take your feelings into consideration, next time she feels the need to "show off" for her new friends.
If Riley and you resume a friendship, let Riley know what it is you expect from a friend, loyalty is obviously very important to you, so share that with Riley, if she finds she tossed a potentialy great friend overboard for some not so great friends.
Also, speak to Monique about what you expect from a friend, Loyalty, respect, fun!
You also metioned that you had Two new friends?
The one you didnt mention, might be the one you should be talking about, she may be the one that turns out to be the best friend you are seeking =) .
Let me know how things go for you, yu really do deserve a good friend! Heck you Deserve a bunch of good friends!
You sound like someone who is a very caring and sensative friend, and those kind of friends are really hard to come by.
Let me know how things are going for you, and I wish you all the very BEST!
Hugs
Tammy