Is there such a thing as making your girlfriend feel too secure?

I've been dating this girl for 3 months and it's going amazing. Felt like longer. Among other things she's said before, she said last night she's really glad she met me. I said the same and told her I had thanked her friend for introducing us before. I also said later, in the context of a conversation, that I had been a little nervous asking her out. And sometimes I tell her I'm going to miss her.

I'm just afraid because I heard something like you never want to make your girlfriend feel too secure, otherwise she'll leave you or something. But this is how I really feel so I don't know what to believe.
Is there such a thing as making your girlfriend feel too secure?
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