I'm not going to always reply to my girlfriends texts
Why are you going to ignore her?
Because I think it's not necessary to reply to my girlfriends texts all the time. She will also not ask questions in texts.
She is your girlfriend, so you should respond. Ignoring her deliberately is very toxic to your relationship and you should always be happy to talk to her if you truly love her.
Well I don't think I should. And it's not like she loves or even cares about me.
If she doesn't care about you and you don't want to talk to her, then just break up. There is nothing wrong with realizing a relationship is over and moving on.