Only dead fish go with the flow

Over the weekend, my roommate had a few friends over for a get together. It actually ended up being really nice and I got to meet so many great and kind-hearted people. Towards the end of the night, I was having a conversation with one of the guys and we were discussing relationships and our current status of where we are at in life in that regard. I told him that I'm sort of going with the flow because I'm still not over a recent situation and I was debating whether or not dating while not being over someone is counter-productive.

He said something that has been stuck in my head ever since:

"I'm totally with you with the whole go with the flow thing because I think that's what a lot of people are doing and it's probably better to do that than to make any rash decisions. However, someone once told me this and I will share it with you and you do with it as you please: only dead fish go with the flow."

It's been stuck in my head ever since because I can't quite grasp on to what I want this to mean to me.

I don't really have an answer and I'm not really sure yet how to go about any of it but I'm putting this out there for all of you reading because perhaps this will serve a purpose to you.