How to respond to "Im thinking about you x" ?

She send me that message after apologizing for being a little bit distant for 2 days. I answered to her apologies by saying "it's fine, I hope that everything is alright. I've been busy this past few days" and told her "I've thinking about you too E ❤️" is that clingy or a good answer?
How to respond to "Im thinking about you x" ?
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