Talk to her. Communication is key. If you feel this way, maybe she is feeling the same thing about you and you are both pulling away from each other for no reason. Always talk out any and all problems and feelings.
Communication IS key ... No doubt ... It may be something you two can work on ... It may be to late ... Or it may be nothing at all ... Talk first ... You don't wanna throw anything away based on suspicion alone .
A relationship is based on trust and communication. If you don't have trust, then what do you have? And trust must be based on communication. Love can't be based on a lie. It can't be based on sex and it can't be based on what other people think. Best bet is to just talk to her. And if things turn out bad, move on and never look back
I agree with your first answer up there. We tend to pull away from someone that we may still love if we feel that they are falling out of love, rather than ask and hear it, we pull away to prepare ourselves for the heartbreak. You have to sit her down and talk to her. Communication is always the key to ANY relationship remember that always.