What Is the Purpose of Memory?

The purpose of memory is so that you can remember the good things that happened to you in the past and how they occurred. It sort of reminds me of the work that was done with rat memory, because the hippocampus seems to store something like cognitive maps. So for example, a person who falls into an emotional hole, that their life is going well, and then their girl friend dumps them, and there they a go and get drunk in a bar and wreck their car. And i unlike the rat what the human mind has to figure out,. why did she leave me? What did i do? Why did i go get drunk? Have i been drinking too much? To process that requires tremendous