My ex and i were a great couple. His family loved and adored me, and the love that him and I shared was unmatchable to anything both of us have ever felt. He's almost 19 and im almost 21. I took his virginity away and i was his first gf.
We lived together, worked together at walmart. It was always us against the world. We were deeply in love!
Then, 3 weeks ago, out of the blue, he comes home with his sister and his sister *****ES me out. Apparently he went over their and told her all of the stuff from our whole relationship that he didnt like...and even exaggerated on many things. He doesnt have the capability to let things go, ever. He holds onto things for many many months and years apparently.

So anyway, his sister convinced him to break up with me after hearing all of this. She got her nose involved and she poisoned our relationship.

Since then, he was the one who broke up with me, but he's the one being REALLY angry and vicious about it. I dont understand. I moved my stuff out, and i tried talking to him. Before we could always talk our problems out..And now..he is ignoring me, says he wants nothing to do with me anymore, and now even worse, he LIVES with his sister -_- . She's a control freak and spreads lies and deceives. She's very manipulative and very evil :/

Anyway, every time i've gone over their to talk to him about it, SHE had to be right there the whole time sitting in the room and refused to leave. Love isnt a 3 way street and it's beginning to piss me the eff off.
Now she's texting me at work and saying "oh he has a new girl he's talking to, he doesnt hate or love you anymore, he just feels nothing for you.." I think she gets enjoyment out of hurting me because im very emotionally vulnerable and weak :/ she's from the ghetto..she's all "rough and tough" so..she likes to stomp on people and watch them squirm.

I cant get through to him anymore now. Now that his sister is cockblocking me in every way and also has filled his head with so much ******** it's leaking out of his ears.
But im so sad. It came as such a shock and i really dont understand why we even broke up...It's nothing that we couldnt have worked on as a couple. Anyway, I think he's depressed now because he's not showering and he's wearing the same clothes everyday at work. (Yes, we still work together) He tells everyone their that he wants nothing to do with me, but why? He texted me and said if i ever talk to him again he's going to get the athorities on me..it's such a 180 from what he was before..why is he being like this?

So, at work he's been leaving early and sneaking off, he told one of our coworkers(an older gentleman, mind you) to fck off, he attacked another co worker with a broom, he spread crap about me the other day, and he's been not showering. So all in all, he's been REALLY vicious, angry, and has been displaying a very toxic attitude and acts like he doesnt care about anything anymore.... i dont understand. He was the one who broke up with me but he's the one that's acting out and is very angry. He's going down a downward spiral. I still love him deeply and want to help. Seeing him suffer like this is breaking my heart. But feeling and seeing the way he's been treating me, especially being very vicious and angry to me, makes me sad. What do i do? I just want the old man i loved back. This new toxic demon spawn his sister made him into is awful. It's pretty bad when i talked to his mom, and even his mom said he's not welcome at her place anymore because of his shocking and mean behavior.

What should i do?
p.s. in a way i also think his sister is jealous of me.
Everyone in the family HATES her boyfriend.
She's married still to one man, and she's "engaged" to this other one that she lives with. She has no room to be giving my ex relationship advice...but anyway. She's all pissed because everyone hates her man, but everyone loved me. So she couldnt handle that i guess and jumped at any chance she could to get us to break up. Also; everyone in the family dislikes her. Even her own mother says that she's really a mean girl..and is ashamed of her behavior. But when i started dating her brother (my ex) everyone loved me. I was always so kind and polite..she hated that.

She has been telling him to hang up the phone on me, to ignore me, and all these negative things. and with me she even gave me a wiccan ritual to get him back. Half the time she tells me to leave him alone, half the time she feels bad seeing me cry and gives me advice to get him back. Idk what to think..why is he SO angry and why did he do a complete 180? Why is he being SO violent now to other people..