Can I get help/advice on this terrible situation?

Alright, so my two best friends for a year was this couple, who shall remain nameless. We hung out all the time; like 3 times a week, and the 3 of us became really close. Well, a few months ago, the girl told me that she has feelings for me, and that she told my best friend about it, too, and he didn't seem too bothered by it, so we continued to hang out. Well a few weeks ago the 3 of us were hanging out, and he just stopped talking out of nowhere. Something had set him off, and she nor I knew what it was. So we went back to his house and he just laid there on the couch, not talking, then he went upstairs and eventually called her up. Essentially they broke up, later on, due to her feelings for me. Well, at this point, I'm like really messed up because I hate the thought of them not being together, but I told them that I intended to keep my friendship with the both of them. After a few days of not talking to him, I got a text from my guy best friend asking me if I had feelings for his ex. Realizing for a little while that I had feelings for her, I responded with "Depending on how I answer that, would it affect out friendship?", and obviously he got his answer from that, but I told him that I'd never do anything that would put our friendship on the line, and I'd need his full approval before I even dreamed of going out with her. Well, he got pissed, and said how I'm going against out friendship and so on. Well, I made plans to hang out with my girl best friend, just as friends, the next day. So, when we were hanging out, everything was going great, until she asked me if I had feelings for her, too. I freaked out, because I immediately felt like I was going against my best friend quite a bit, and that was against everything I stand for. So I told her that I didn't know how I felt about her, then I told her that I did have feelings for her, but I can't act on them unless he approves of it. She then basically broke down, and when she left, she called him to ask him why he's not okay with it, and he essentially flipped out. He was threatening her and me, through text messages, and so on. Well, a few days ped, and he got more okay with the idea of us together. I knew I needed to talk to her, in person, to make my stance a little clearer to her. So she came over, and we had a long talk which ended with the both of us deciding that things were moving a little too fast with them just breaking up, but that I definitely did want to date her. So, we agreed that we'd start out somewhat slower, and eventually go into a relationship. So the next time we hung out, we went out to Taco Bell, and then to see Terminator: Salvation, in which I paid for everything. Sounds like a date, right? Well, I wasn't in contact with her for a few days, but then I heard from my other friend that she just got back together with her boyfriend, my best friend. So I was completely crushed...especially after we discussed everything. Now, I didn't talk to them for a couple days, because I figured I'd say something I'd regret. But when I did talk to them again, I told them how hurt I was by that, in which neither of them really cared about at all. He basically told me to leave her alone, to f--- off, and that I have no reason to be sad about it, because she and I weren't together. So I told him that until she tells me herself that she doesn't want me to talk to her, I still intend to, and that we essentially were together, because we talked about dating, and everything...not to mention we did essentially have a date. Well, later on, I get a message from her, telling me that she and I weren't dating, that she loves him and not me, and that I need to move on. So I messaged her back, asking if she'd still want to be friends, because we have so much in common, and she pretty much said no, because things are too "weird" now. And since that, my guy best friend has text me a couple times basically telling me that he's really happy with her, and that all I am just lonely, and nobody likes me, and that I have nobody, because I treat everybody horribly. So, I blocked him on facebook, so I won't get any more messages from him, and she deleted me as a friend. So, that's basically the situation, which has made me severely depressed for the past few weeks, and I desperately need advice. I'd appreciate any that you can give...thanks.