Every time my girlfriend talks to me, she doesn't want to say a word or two.

First, find out whether she is really busy these days. She is tired. Don't doubt her feelings for you yet.

If you see that she spends more time playing at the end of the day than talking to you, and would rather be bored than talking to you, it may be that her feelings for you have faded again.

I suggest that you don't argue, but make it clear and find out where she started to change. Try to make up for it.