I didnt know

I just broke up with the one person I loved the most. I wasnt the best girlfriend, I didnt do the best things in our relationship, I guess the inevitable happened. How do you tell the person you love that they deserve better, that the way you've been loving them isnt what it's supposed to be like. I love Danny. This is perhaps the greatest love I will know, but did I really have to let him go? Why does love not have a rule book, why is it always trial and failure? I know im doing the right thing in telling him to find someone better, someone who wont cheat on him, someone who will be a fresh start, but i cant stop crying about him being happy with someone else. We planned a big future together, with kids, a house in Maryland, and plenty of wrinkles. How do I let a love like that go? Is it the right thing? Will i actually be happier? Someones got to have the answer to this.