Karen, I have two marriages behind me, and I know how upsetting it can be, despite being done for all the right reasons. I would just like to offer you my sympathies. It does get easier, but don't jump into another relationship too soon. I can understand getting attention from a work colleague and how flattering that can be. I have also been in that situation as well. Just concentrate on you and getting your emotions back on track. The last thing you need right now is to be embroiled in some love triangle.
I wish you much happiness for the future. xxx