<human>: Year long relationship so far and something horrible has changed. Something changed about my SO and I don't know why or what caused it, but he's beginning to accept a possible break up. He is stone walling completely and I know I haven't done anything drastic to cause that. Yes we've argued, but nothing has been said or done to cause him to actually put walls up. He went from being major depressive to an angry stress ball. 

We live far apart right now and maybe he's becoming to realizations it's too much for him. Regardless of whatever the reasons are, I am completely devastated. He showed me that I could believe in someone and count on them, but now I feel like I am being abandoned again. I don't know how to be happy anymore or how to get through this. How can you possibly work on being happy when you have absolutely no one, not even family? My life now feels meaningless and empty. My self worth has gone completely and I don't know how to get it back. I was always a strong individual, but this guy showed me it was okay to be weak, especially for the love of your life. Now that's all I am, I am weak and I can't even get out of bed. I feel absolutely hopeless and I am trying to prepare for when he may break up with me. 

Right now he has stated he needs time to himself to re evaluate everything. This is all just so unreal. I don't know what happened to him or why his anxiety has gotten so bad. He freaked out on me for some of the most trivial things. He's falling apart and I have no idea why because he isn't even able to comprehend it himself. It's just so hard to watch your SO let their mental health deteriorate and there's nothing you can do to save them. I feel like he has hit such a low point that he has just gone mad. I think I have lost him for good. I am slowly falling apart as I wait for him to be ready to talk.

Can you condense the text into a few key points?
<bot>: My SO is falling apart from his current mental state. He's majorly depressive and has gone mad. I want to help him and I want to save this relationship before its too late...or is it too late?