What is the happiest time for two people to be together?

I think the two people together the happiest time should be two people, mutual understanding each other are for each other's sake, this should be the happiest time, after all, if you know that there is a person all the time are thinking about you to do what you want to do for your own good, you will also feel very happy, so the two people together the most important is to understand each other.