OK, I just went through an ADF problem with my female, Ocean. Ocean is the dopeyiest fish ever, and is very gentle. I put an ADF in with her, it attacked her ONCE, so she grabbed it by the leg and started trying to tear it apart. I had to take the frog back.
My friend also had a betta and an ADF, and the same thing happened (except her fish actually killed the frog!). I don't know what the problem was.
I don't suggest ADFs and bettas. There seem to be very mixed reviews about bettas and ADFs. Plus, they are a hassle to feed.
I've heard great things about shrimps, snails and bettas. Good luck!