Finding a new love isn't going to help you move on if you're not ready. It sounds like you're not ready. My ex married his affair partner (20 years younger) and got her pregnant. I feel a lot of the same fears you do: will the kids like her better? Will the ex still pay attention to his kids now that he has a new family? How come he gets to move on blithely happy while I have to wallow in my heartbreak?
But dating before you are ready isn't going to help you feel better in the long run. I started dating about 7 months out from the initial separation and found that time in between valuable for exploring who I am and what I want out of life. I probably should have waited longer, but overall I think the time was right for me.