Help me!! I don't know if I should tell her how I feel?

My Ex and I broke a little less than two years ago, since then I have convinced myself that I hated her, and that she was the worst person in the world. But this past weekend at a mutual friends wedding, She and I talked, the moment I heard her voice all the hate melted away. Now I'm sure she is the love of my life and I will never find someone who makes me feel like her again. I think she is the most beautiful and special woman in the whole world. When we spoke at the wedding it seemed wierd, a good weird I guess, and some of our mutual friends thought so too. I don't really miss Her though, I miss us. Lemme explain, Its not that I'm in love with her, or even want her back, its the fact that for the rest of my life I believe the woman that I'm with, will never compare to her. I know I can find love again, I know I will, actually, but never something so whole. Our relationship, before I made a stupid mistake, was perfect. We couldn't be more in tune, but I admit I made the first, and biggest mistake, but we both made mistakes and both hurt each other. We were together for almost 3 years, and had a nasty break-up. But I think enough time has past for both of us to look past the BS and be able to start fresh. The only problem is that she is still with someone, I don't know exactly how they are, but I think that it isn't exactly going great. I'm wondering if I should tell her how I feel, stressing the fact that I'm not begging for her back, and that she doesn't have to answer me. Or should I let it all go and p. My big dilemia is "what if". I think the "what if" for the rest of my life may hurt more than putting my heart out there to be crushed again. I know if I do talk to her, not to expect anything. And I know its a longshot, can somebody help me? I haven't been able to sleep since I heard her sweet voice.