It is seeming as your innocent crush is/has turned into an unhealthy obsession. Pursuing any furthur contact with this man may cause some serious repurcussions. If he feels you are crossing lines (fake i.d.) He may take steps to keep you away from him (ie. a restraining order, that is the extreme) but what if he tells your employer and gets you fired or something(you mentioned you work together so that is a major concern). That isn't something you want to have happen. Try and get some help to get this guy out of your mind so nothing bad happens to you. Take care