How are you with your girlfriend? Do you fight, and if you do, is it just a petty argument or do things become serious? Well, if your girlfriend is often very quiet and doesn't argue with you at all, there might be a problem. Instead of looking at silence as a way of getting respect and agreement, your girlfriend might actually be hiding something from you. Maybe she's mad, maybe she doesn't even care anymore that she won't speak up. Sure, this doesn't apply to every relationship, but boyfriends should know that
If your girlfriend is satisfied with just being silent all the time, maybe she doesn't want to share things with you anymore. There might be a problem, and she doesn't see the value in sharing what she feels. Go talk about it.
If both of you got into a disagreement and your girlfriend immediately gives up or stays quiet after the fight, it could be an indication of giving up on the entire relationship. Maybe she thinks that it's just not worth fighting for.
If you want a girlfriend who doesn't talk back, you should probably have just bought a toy or a dog. A girlfriend that cares will tell you what she thinks is wrong with the relationship, and she will not be afraid to have her word if it's for the betterment of the both of you.
If it seems that things might be too good to be true, then that's probably because there is indeed something hidden. What if you do something bad and your girlfriend is okay with it? She should be worried or at least angry, but she's not. That might mean that she has someone else, or at least, she's open to having someone else. Talk about it. Assure the happiness you believe in.
If your girlfriend is not busy keeping you awake with all her stories, there could be something hidden. There might be secrets, and that could be a problem in the long run.
If the both of you want to keep the relationship, the both of you should have a say. It's that simple.
Solve problems together. Don't let the other one be passive. If there's a disagreement, argue and have a compromise. Learn to fight for your love.