I became a vegetarian for ethical reasons; I trust it's not hard to imagine or look up what those reasons are. At the time, I felt strongly about this. Over the years, I discovered I felt less strongly about it, but it was a deeply ingrained habit by that point. I also discovered that even though I no longer carried a deep moral imperative to not eat meat, I still carried a deep personal connection to the person I was when I did carry that imperative.

I eventually decided I didn't care about fish that much - but I decided that I would eventually eat fish again years before I finally did. Yes, it's a compromise of my original ethical judgement, but it's one I can live with.