Pivotal Moment

So today she says she had been thinking about dating for some time, and that she had posted a note on her bulletin board at work looking for bike buddies as a great way to meet guys.  This was as she finally told me she loved me and we had sex (I won't say made love because while that was true for me, clearly it was just sex to her).  She posted the note either right before or the day after and decided to date her new man, with whom she says she has an open and honest relationship already, that same week.
More pain.  More incentive to somehow block these thoughts of her from my mind and move on.  I wish I could find an easier way to do that - stop thinking of her, or of her and New Guy, of of how we used to be.