I had this same problem with one of my ex-girlfriends. I chased myself into the relationship without really getting to know her and by the time I had gotten out of it I was shaking my friends and telling my friends that she turned out not to be the person I fell in love with.
A problem occured at this stage though. Because I was very natural and acted normally when we first met - she fell in love with me and still is today. I fell out of love because she turned out to be different to what I thought. In the end I cut all ties - she said it hurt to much to talk to me because I was everything she wanted. I didn't want to be with her because she bitched, moaned, smoked, binge-drinked and occasionally belittled me for my sexual inferiority.
Wait, I didn't mention that last one did I?
My point it that you will grow into and out of relationships. When I first split up with my ex, I would constantly feel pain when in answer to my friends question - 'What happened?' I would shrug and tell them that 'She isn't the person I fell in love with anymore
'. It's sad but the pain eases over time and no longer then a month later she had moved on and found another boyfriend and I was happily single, reading lots of books on spirituality and religion and throwing myself with uncontrollable passion into my favourite subject - maths.
With friends however the general consensus is that you don't cut your ties fast. You let it fall away slowly and put new people in their place.
I wish you the best of luck.
Seriously though, that last one was a joke