Friendship Lost

This is going to sound so emo but I just don't care.

I started off this year with three really good friends: Kaydie, Jessica and Shawn. We spent New Years together, they have all spoken to my boyfriend over Skype, we used to do everything together. Then something changed. Kaydie and Jessica had it out and ended their 6 year friendship. Shawn and I were stuck in the middle between the two and we tried to stay neutral but it was hard. My mother was in the hospital and I needed all of my friends, but with those two at each other's throats, it got harder and harder. Eventually, Jessica was left out in the cold with just me as her friend, as Shawn had, inadvertently, chosen Kaydie's side.
After this had happened, I too was left out and I eventually told Shawn how I felt. I made sure he knew that he had hurt me very badly and I wasn't about to allow him to treat me like I was nothing, and told him that he and I could no longer be friends. It hurt, and honestly, it's been almost a week and it still hurts.
I have always been the type to give until I can't give anymore. Money, clothes, food, emotional support, it didn't matter. If I had it, I would give it away if someone needed it. That's how my mother raised me. As good as this sounds, it makes for bad friendships because I get used a lot. Which, I feel, is what happened with Shawn. Whenever we went out, if he needed gas money, I would offer what I had, and I never asked him to take me somewhere if I didn't have at least $10 for him. When we went out somewhere, I would usually be the one buying someone drinks or food, and I didn't complain because it wasn't a huge deal to me. He was my friend. It didn't matter. However, it got to a point where he only hung out with me when I could give him money. He only hung out with me when Kaydie asked. He only hung out with me when everyone else was busy. I was his last resort and with my mom in the hospital, I needed people. And he stopped being there for me.
Many people will probably read this and think that I'm over-reacting. I'm not. This is the third time this has happened, and the 5th time we've fought. There are only so many chances that someone can give to a person. I had had enough. Shawn seemed fine with losing me, but not fine with losing Jessica. He texted her saying that he didn't want to lose her as a friend, and if she forgives him, then that's fine. I just know that I can't. I'm not saying that he never helped me. He did. Many times. He drove me to see my mom many times. He came and got me from my grandmother's funeral. He was there when I was in horrible shape and needed someone, but at a time when I need someone the most, I can't have them flake on me and he seems to do so at the worst of times.
With this, I have also seemed to lose Kaydie; the first friend I made when I started school and the one who introduced me to Shawn and Jessica. I know that everyone is going through hard times, but I wouldn't ever want to lose Kaydie. If I have, I won't go begging her back, but I hope she knows I love her.
This year has been a shitstorm, and all I hoped for was some support. I have Jessica, who checks on me daily and lets me know that I am supported, but I have lost someone who promised to always be by my side, and someone who is slipping away due to the first loss. I feel utterly alone, and I wish I knew a way out.