Regret is a Great Motivation

A continuation from a previous post.
It is definitely hard to forgive and forget, but once one person takes the first step, it makes things a lot easier; though the first step itself is hard to make. When you begin to think about the fact that you might have to live like this forever, not being able to talk to the other person over a stupid argument, you then become aware of the fact that you might just regret it. Say, if something happens and you guys get separated and aren't able to see each other anymore, you'll definitely regret wasting all that time that you could've spent together. Regret is the best motivation to take up new opportunities and experiences. Because of regret, I decided to take the first step and make a conversation first.

Now that I've taken the first step and it seems as though everything is back to the way it was, can we simply move on just like that and act as if nothing happened? Or is it necessary to talk about it before we can truly forget it all and move on?