I have been living quite a busy life for the past several years, and recently it all caught up on me in the form of a nervous breakdown. This came to me in several ways, one being diagnosed as a form of stress and depression, the other as an epiphany of sorts, which is where i pick up on this forum.
It occured to me that after just over a year i have been treating my partner as maybe third best in my life, not to say that I wasn't in love with them, and i would have done anything for them, just the majority of my time was taken up by two other things.
Needless to say, after said "epiphany" i readjusted my focus on life and closed the doors on the other 2 things, wanting to focus myself on repairing and loving my partner. With all the crazy-in-my-head-stuff thats going on (I won't go in to detail cos anyone thats been there knows the crap that comes with the territory) I have found my partner to be less than supportive, in fact quite the opposite. They have been neglectful, hurtful of our past, bitter of the last few months, and seem to go out of their way to party with anyone else they know/put everyone else over me/live life to the extreme and flat blank refuse to acknowledge the fact I have this problem.
So what I'm asking is, what do you all think?

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I think they're angry over how you've treated them, and passive-aggressively taking it out on you by doing all that stuff. And they are probably angry at you for just expecting their support by saying "I've changed." You two need to have a talk. It's understandable that they're angry, but in that situation, you either end the relationship or work to let go of things. By staying with someone you're agreeing not to hold resentments. You can't consciously be bitter and have the relationship work. Which you're obviously aware of, but they may not be. Maybe they feel like you're not really realizing how much you've hurt them and are de-emphasizing it by talking about how much you're changing and now need their support? You just really need to be really open with each other. Tell them how sorry you are and how much you love them and want to make it up to them but that you need their support, and listen to everything they have to say.

I think Awful Cherry is giving you some good advice. It souds like you are mad at eachother and not talking about it. It also sounds as tho your significant other does not understand what is happening in your life. But then again, maybe you are not understanding what is happening in theirs.
You definetly need to have a talk. It's the only way you'll be able to understand what is going on between the two of you.

On the other hand, because of what you are going through at the moment in your life, is it a possibility that both of you would be better off without the other, at least for the time being?