any advice for the broken hearted? :(

I'm sorry this is so long, but I could really use some major help!  

So I've just had my heart smashed into a million pieces and need advice from people that have maybe been there.  It's funny how when you really need a friend, they are nowhere to be found!  

 I was dating this girl for a year and a half now and this past week, things finally ended.  When we first met, we instantly clicked and our relationship was incredible.  We met in college.  I just graduated and she will be there for another semester.  We had the type of relationship that most people would roll their eyes at because it really was just that fantastic.  She always loved to party and I'm more of a homebody, but we worked with it and had an incredible time in our relationship.  I never fully trusted her in the beginning because she did cheat on nearly every single one of her ex's, however I do know for a fact she never did cheat on me.  She would always tell me I was "the one" and that she wanted to marry me, have children with me, and live her life with me.  I believed her.   I have never felt this strongly about a person and didn't even think this feeling was possible to have for another individual.  While our relationship did sometimes frighten the both of us because it was so strong and serious, we managed to always realize we needed each other.  Starting this past January things started to get strange between the two of us when she was "feeling overwhelmed" and just needed time to herself.  I barely heard from her for three weeks except for maybe one text message a day telling me she was alive and ok.  Following that, we discussed what happened and were back on track with little to no issues.  We of course had stupid arguments, but never anything extremely serious.  In May, when we were moving out of school and I was moving home permanently, she assured me we would work hard at our relationship and we would stick together because she loved me and couldn't imagine not having me in her life.  Roll forward to now.....

For the past 3 weeks, I've known something wasn't right.  She basically stopped calling me and texting me all together.  I asked her what was going on and all she could say was, she is not happy with how anything in her life is going.  I have never seen her in quite this dark of a place before and it bothers me that instead of letting me help her, she has pushed me away.  I let her have her space as hard as it was for me.  My heart was breaking because she had never treated me like this.  On Monday I finally asked her to discuss our relationship and she informed me there was nothing to discuss.  Needless to say I didn't take kindly to that.  After a year and a half (and basically living together), she had nothing to say and planned on just ingnoring me until our relationship crumbled?  I could not believe it.  She told me that, "I should have never fallen in love with her" and that she is sorry she cannot be what i need right now.   She told me how she will never stop loving me and will never forget me for a minute, but that right now she is not happy with anything in her life and because of that she cannot be with me.  She said we both deserve to be the happiest we can be and right now we weren't.  She asked that someday I can find it within me to be friends with her (Which i don't think will ever happen because I don't want her as just my friend.  I want to love her as something more).  She informed me no one could help her through this and that she's been drinking to try and find hapiness.  This is all unlike her because she has never been this unhappy.  I can't help but think that she may not have wanted to end the relationship, but she felt guilty for putting me through hell while she works out her unhappiness.  She never said the words that we were broken up and she also informed me that she will never be able to live with the past that she has broken my heart beyond repair.  I asked her if she ever saw us being together in the future and she said it was possible, but right now she can't be with me.   She still says she is in a relationship on facebook (i know thats something stupid to go by) and she seems to be going out of her way to write quotes that focus on being strong, getting over everything, and celebrating.  In my opinion this seems like a cop out and a way to make me think she is ok....i mean after a year and a half you would think she would have some feelings or pain towards this.  Since breaking up on Monday and not taking it well, I have reached out to her letting her know that i support her no matter how hard it is for me and that i truly hope she gets better.  i let her know if she needs anything i will be there and that i hope someday she will come back to me once she finds what she needs.  

this is where i need the advice.   i have never been this devistated in my entire life....all i want to do is lay in bed and cry and cry until i cannot feel anything anymore.  i have never fallen so deeply for someone and i guess what makes it worse is all of teh false promises that were given to me by her.  so here are the questions.  Do you feel that someday i may have another chance or is this a completely lost cause?  Has anyone ever been through this?  How did you get through it?  Also, if you were the one in the relationship who did something very similar, what were you thinking?  What was running through your mind?   I just feel the way this relationship ended was so unclear, selfish, and abrupt.  To know that I will never see her again absolutely kills me and tears me apart.  that after a year and a half, this is how it ends?  Seems kind of shitty to me.  I would love an answer from her, but i know it is better to leave her be for the moment.  There was no closure or even a goodbye.  Everything just stopped.  

Any advice?  I would greatly appreciate hearing from outside sources.  I have never been this hurt before.  Thanks for listening.