Why did she lie about being "violated"?

[Bobby]

I'll be 19 years old on the 30th of this month. I've been involved in a hugely complicated drama lately, and just recently found out that my girlfriend lied to me about being violated (raped) by someone. This someone's name is Chris, and for a long time I wanted to kill him for what he did. That is until the cops let Chris's parents know, and they paid me a visit last night. They told me that Chris hadn't hurt Kasi (my girlfriend) when they were together, and that he had shaken Baby syndrome. Apparently, Chris (although he is 20 years old) has an IQ of 50, and functions at the level of a seven or eight year old. He writes at a seventh grade level, and is clueless about what is going on all of the time. Not only that, he is extremely gullible, and will believe anything anyone tells him.
My girlfriend has aspergers, but I am very upset with her for lying to me. I waged an all-out war on Chris, posting what I perceived as transgressions against Kasi on my facebook page, at a non-stop pace. So you can only imagine how terrible I felt when I found all of this out about Chris. Chris's parents even had copies of emails sent between Chris and Kasi when they were still together, proving that Kasi did not feel violated by Chris's actions that Sunday morning in May. I also was told by Chris's parents that Kasi's mom was irresponsible, and dropped Kasi at Chris's condo promising to pick her up at 11:00 AM the following morning, however she came to pick up Kasi at 4:00 AM the next morning.
When Chris told Kasi's mom that he had sex with Kasi, Jill (who is Kasi's mom) tried to charge Chris with Statutory Rape. Chris's parents went on to say that they tried to contact Jill to set some boundaries between the two adults, but apparently Jill avoided Chris's parents, which lead up to Chris and Kasi having sex. The irony is of course, that if Jill had successfully charged Chris with Statutory Rape, that BOTH Kasi and Chris would have gone to jail.
I'm beyond pissed because I was only trying to protect Kasi this whole time, but all the while both Kasi and her mom had been responsible for most of what happened. Apparently Chris was very scared and shaken up when the police informed him that I intended to kill him for violating Kasi. So naturally I told Chris' father to tell Chris that I was sorry for threatening him, and I also extended an apology to Chris's parents. Now Chris's parents have a restraining order on me, and I have to go to court two days before my birthday (which is the 28th of this month). I know that I'm going to look like complete asshole in court for everything that happened. Chris's parents don't seem to be angry with me, in fact they seem to be making light of the situation.
I feel so horrible for everything that happened, and I'm very angry with Jill and Kasi. i'm seriously considering breaking up with Kasi because of this, but I want to give her a chance to explain herself first before I do anything. I've been suicidal because of this whole situation, it has left me in a giant mess, and it feels like my whole life has fallen to pieces. Does ANYBODY have ANY suggestions on where to go from here?

[Josh]

That is honestly a big mess. In all seriousness, this drama will pass over a couple of months (depending on how court see to fit yours, Chris, Kasi's and Jill's behavior in the matter).