My girlfriend never says she misses me?

Sometimes when I don't see my girlfriend I'd text or call her to tell her I miss her (and yea, I mean it). She'd respond sweetly but she has never said she misses me when we are not seeing each other. It kind of makes me feel like crap because I'm wondering if she even thinks about me for a second when I'm not around her.

Should I be worried?
My girlfriend never says she misses me?
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