I was the exact same way as you. I never had a particular liking for fish (but I didn't dislike them either), but when I wanted to get a new, small pet I decided on a betta. After getting Link I realized that you CAN love fish, and get super attached to them. I actually feel the same in that regard too, where if I get close to an animal of a certain species, I never get that species again because it wouldn't be the same. The only other bettas I have gotten besides Link were for rescues, who have all gone to good homes or unfortunately didn't make it (except my last one, I'm trying to rehome him). I don't think I ever want another permanent betta. But who knows? Link... He SEEMS fine. Eating, swimming, and all his usual stuff. But his fins seem to look worse every day. I have tested his water and I know it's safe, so I have no clue what's going on.
Kindness and respect should be shown to all animals, no matter if they are furry, scaly, big, or small. Be a hero to the animals and GO VEGAN!