Oooh, before I forget, wanted to relate a success I had today! This morning, my SO left for work earlier than me as I was scheduled later, so I had a good three hours of time alone. This kind of situation has frequently proven my downfall, as time alone at home means a)I've no pressing concerns to occupy me, like work or an immediate chore b)she's not home to catch or stop me, and won't be for some time, which means I can relax and take my time rather than have a furtive anxious experience.
I resisted! Everytime I felt the urge (which was frequently through that three hour period), I actively brought up thoughts of her and what I was trying to achieve, why I wanted to stop, and what could happen if I gave in. So, a small success for me, but one I needed nonetheless.