(Update after last question)... "Why does my girlfriend flinch so much?

So i sat down and tried to talk to her about it. I simply said I noticed she flinched a lot, and that whatever the reason why she did, I would always protect her and never hurt her. She looked at me like I was crazy, she said she was never hit or anything like that. But I could see the tears in her eyes and she looked as if she was about to cry. I know her very well, and I know she was lying. Please help what do I do now?
(Update after last question)... "Why does my girlfriend flinch so much?
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