How many gallons is this tank, size of fish.
A Texas grows to 10+ inches and having a spawning pair you would likely need a 75g. 48"x18" and even then a divider may still be needed. The bully behavior is part of breeding. It's the male showing he wants to spawn and if she is Un willing he can potentially kill her.
Besides that a full grown Texas male or female will need a minimum of 55g to themselves. Thats why I asked the size of your tank.