My ex-boyfriend is getting married tomorrow. Why did he send me a message?

Showing off, this is called reunion challenge. You have seen "Love Apartment 3", you will understand that it is obvious that two lovers meet again after breaking up, just to let each other know how happy they are. PK happiness is more or less true or false, but the most important thing is not to lose to each other and know that they are happier than others, so it is important.