Even if the obsessive ex has moved on, and re-married the next “victim”. They obsessive ex will still continue to believe that they have the right to abuse you. They feel a sense of entitlement, that even though they cheated on you, and left you, they pretend all of their horrible violations against you were/are justified. So when you try to move on with your life, they will be hell bent on making your life difficult.
Often times, the obsessive ex wants things to be just as they were before they lied to you, cheated on you, destroyed your family, and drained your finances, energy, and spirit. Unstable people believe that all the rules apply to everyone but them. They believe that they are allowed to move on with a new partner, but they do not believe that their Ex is allowed to move on or be happy. Once the obsessive ex finds out that their ex has found someone, they become obsessed with making their ex life hell, and the man/woman that they have moved on with. They still want to control their Ex, they realize with a new someone that they may lose control.