Why pregnant guppy chased?

"Why is that girl chasing after her boyfriend?" or "Why is that guy running from his girlfriend?"

It's simple- some chicks just aren't intimidated by men. Fish have varying personalities, some more dominant than others. When a male and a female betta are put into the same tank, the pressure for female submission is on. The key to a successful betta-spawn is for the female to submit to her man, giving in to what he wants. Sometimes female bettas just won't tolerate it. Either your male is a bit too docile, or your girl isn't interested in spawning with him. Just like humans, the fish have to feel a connection with one another. Chances are you'll encounter more than one incompatible pair during your betta breeding life.