Sounds like you may need a Walkabout.
There's nothing inherently wrong with taking some time out to find yourself. And, there's nothing to say that you can't return some day. The risk is that once you've taken that path, when you return, their paths may have diverged enough from yours that you're not really able to walk together again.
It's going to be a tough decision. I wish you the best.
Me: 48 - Married, straight, male
Shiela: My wife.
Suzanne: My FWB
Adam: Shiela's LDR