What to do with girl becoming too needy/insecure after sex?

Have been going out with this girl and on the third date ended up back at my place where she spent the night. When she gets home she texts me "had a great time last night" and I responded with a "me too" sorta message...hour later though get a "thinking of you"...and this continues throughout the day - "I'm doing of this...made me think of you" about 5 more times...I only ended up responding again later in the evening. I want to assure her I'm not some jerk that will drop her now that I got her in bed once but I'm also not the sorta guy that can handle a girl that is really needy which it seems like with all this "thinking of you" stuff. We are both in our early 30's and I thought we were past that. Is there any way to handle this one?
What to do with girl becoming too needy/insecure after sex?
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