Do you feel that dating others is necessary to show that one has "moved on"?
Depends why you are dating them. If it is just to show your X that you have moved on then no it's not a good thing (or necessary) but if it is because you want to date and enjoy being with that person then yes it is a good thing and does show that you are slowly moving on.
Me 43 XH 45 M 2.7.88 Divorce 7.10.09 Kids D20,S17 & D15