If it is a peaceful breakup, I think it is necessary to say hello, because both of them still have some feelings and can continue to be friends. This situation is rare. After all, how many people can break up peacefully in this era? Most of them are psychological, so this kind of situation can basically be ruled out, but if it really happens, you must go up to say hello casually, which can alleviate the embarrassment of both sides a little.
But if it's dumped, I don't think it's necessary to say hello at all. Just do what you have to do. Such a man doesn't need to press his own iron, but also remember to show his perfect side and let himself know how much he has lost. In fact, this situation is in line with the current female love, because most men are more playboy now, so I don't think it is necessary to give him a good look.
The word ex-boyfriend has been heard so much in the circle of friends that my ears are exploding, but there are still many people who have been in love for a while and then broke up. In fact, this has a lot to do with their attitude. Since they don't like it, don't start so soon at the beginning. Why did they break up in the end? Many girls go to the gym to make themselves better through fitness, and then make their ex-boyfriends regret it for the rest of their lives, but if they meet each other, they must make a concrete analysis.