Dealing with a stubborn girlfriend, help?

How to deal with a stubborn, cold girlfriend? I would always make the calls and text her, she would never do any efforts from her side, that wasn't the case in our early days... I know she likes me a lot and all but I don't like to play such games.
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I told her two days ago that I love her, she didn't respond but rather said she's out of words.
Dealing with a stubborn girlfriend, help?
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