Gotta agree with the other posts here, put this relationship down to experience, learn what you can from it, about human interaction, yourself, and addictions.
Your last post tells me that you have indeed had a rough year and you are right, sometimes we need to experience the bad so we know just how good good can be.
Take a year for you! I would definately look into getting some counselling/therapy. I know from my university that these services were available for free for students. Have you spoken to your Dean/personal tutor about your struggles this last year? You'll be suprised at how supportive your college can be. At the end of the day they know life can throw crap at you and want you to be able to carry on with your studies.
One of the hardest lessons I ever learnt was that no one would ever be there for me, if I want something in life, I am the only person I can rely on to get it done.
Good luck and welcome to SR. Hope you keep posting with us.
Lots of luv
Lily xxxxxxx