Just wanted to share my story of the day...
Went to Petsmart to kill some time. The males all looked pretty well. They each had a piece of live plant in their cups and a lot of them had bubblenests. I saw a pastel version of my guy, with pinkish-red on the bottom of his fins instead of white. Sooo cute.
But anyway, the problem was that I saw a female in a tank with some fish. Major stress stripes and nipped fins. And the cause was soon noticable, there was a male betta in there with her!
I finally racked up enough courage to tell the employee working there about it. She was really nice about it, though. She seemed to have enough sense that she knew right away what I was talking about, and said they shouldn't be kept together. So she scooped out the girl and put her in a tank with ADFs and thanked me for telling her.
Well, if I coulld, I would have gotten the girl. She was violet and soo cute. But at least now I can have peace of mind knowing that she's safe.