The problem of stereotypes in relationships is no longer a novelty. But there is scientific evidence about the stereotype associated with separation. Men and women have different ways of dealing with separation. 
Men more use distraksi and rejection as a form of self-defense to fight the stress of separation. They think to find the lost replacement as soon as possible. A broken-hearted woman will try to keep her pain for some time after the breakup. This happens because women generally have more feeling investment when they are in a relationship. 
If now you see your ex have started looking for a new partner, do not be too sad Bela. Not necessarily he has completely recovered from his pain. He could just be looking for an escape from his pain. She is just trying to increase dopamine in her to feel happier.
So, no longer need to cry for him who is now displaying a photo of his new lover. Remember, not necessarily he forgets you, he's just trying harder to release you from his life.