Starting from scratch...

So, now I'm in the situation of having ended a long and arduous relationship that probably would have benefitted greatly from having deteriorated in the earlier stages of its existence. Be that as it may, it's over and I'm left with the task of starting from scratch and let me tell you it is not at all easy. I mean, the transition from back and forth emotions with one person for so long and then the end of that rollercoaster leaves you with an uncanny ability of not know which way is up sometimes. Honestly, how do I start over and how do I repair my heart and allow someone else to hold on to it?