You need to first decide yourself whether you actually like him or want to forget about him. Remember, though, that he is married and he has no business going around with you, leave alone making out with you (this applies equally to you too, my dear!). Your post suggests that you want him yet despise him at the same time. I would recommend that you keep your distance from him and limit your interactions to the minimum required. Press the 'Delete' button in your mind so far as he is concerned and try seeking healthy and worthwhile friendships at the workplace and elsewhere, engage yourself in doing things that interest you or you are passionate about- the possibilities are aplenty. If your distractions have not worked so far it only implies that your resolve to "forget about him" has not been strong enough. If nothing works then try re-locating, if possible. I am hopeful that you can overcome this easily. All the best!