I had a relationship very similar to yours in length not so many months ago. It was a mutual break-up, although the relationship had been very good on the whole (as you said). We'd also both said that we loved each other, although we have both since decided that it perhaps wasn't love. We agreed to stay friends (which was pretty essential given that a close-knit friendship group seemed to have formed around us), but he soon turned very bitter, as I was coping better than him with the break-up. Then, less than a month after we broke up, he started going out with one of my best friends. My turn to be bitter. However, everything is fine between us now, and we can chat for hours, oddly much better than we could when we were going out. And I never thought during the days after the break-up that it'd end up this good. So, basically, my advice is to be optimistic about it. You have to appreciate that everyone reacts differently to break-ups, but if you both move on (after you've had some breathing space) then I think you could become good friends.
Oh yeah, *hugs*.