how do I explain this. . . .

I cried more tonight than I have in months. He terrifies me.
The things he asks of me are more than I have ever given to anyone else in my life. Complete forgiveness when I would rather hold a grudge. Trust when there is absolutely no reason why I should trust him again. These emotional battles are the most challenging things in my life now and maybe ever. . . so far.
Giving my heart and soul into the care of another, I have never done this with anyone. He brings so much joy into my life and it was a shock to realize I could be so happy with anyone. Dinner with a guy who I have eaten an uncountable number of meals with and I have a million butterflies inside at the idea of seeing him. After everything we have been through - that you still make me feel this way is beyond my comprehension. I was with someone for 8 years who never affected me this way.
When I was 20 years old I met someone who is a truly wonderful person. We started spending time together and really liked each other. Then we started dreaming together, we created all these dreams for our life and what we would do, what it would be. . . then I ended up married to those dreams. When it all fell apart, I mourned the loss of those dreams.
I realize now that relationships are not made of the stuff of dreams. They are made of those tiny, breathless moments and in the best relationships, they happen over and over again. What we have leaves me breathless, over and over again. Every moment with him is timeless and amazing. I have never had this before and I am not sure that I will ever find it again.
Can I walk away from this and live my life knowing that I decided not to give him another chance?
So when he tells me that he is sorry for everything, that he is sorry for being afraid, that he is sorry for being his dad, and wants to do whatever he has to do to be with me, to heal this, to get back to where we were and then keep going all I can do is sit, with his arms around me, and cry.