This is really not the right attitude to have as a cat owner. Keep the cat carrier out and open. Put a comfy blanket in there, food, treats, toys, make it a happy place so it isn't so scary when she goes to the vet. This is a very easy thing to do to help her. Pick up some Feliway spray to spray in there too.Well, she is a very anxious cat about travelling and going to the vet so he doesn't want to put her through that unless it's absolutely necessary.
Your boyfriend had 11 cats thats fine but if he never took them to the vet until he SAW something wrong those cats were sick a long time and possibly suffering even.