How to deal with guarded girls?

Anonymous
I am dating this girl and she is really open with me, but I think she's guarded. When I asked her out on dates I know she's had a good time. Last week she texted me that she had such fun on this date.

I tell her open things and she always texts back "thanks for being open".

She doesn't look me in the eye when she talks, she's usually looking elsewhere. When she leaves, she will always look me in the eyes.

She got in a pattern of texting me and now she's a bit silent.

She's talked to me about the duds she's dated and I always got the sense she was a bit guarded or easy to screw up with her.

How do I approach this girl? She's very very attractive.
How to deal with guarded girls?
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