One time a female friend of mine that I wanted to fuck...We hadn't hung out for a while, and she texted me to see what was going on and said something along the lines of "I miss you..I feel like you forgot lil ol me!!"
My reply: Yeah, sorry..I've been real busy trying to forget you
She replied: hahah smooooooth
Keep in mind this girl has been around haha Shes a great girl, and a great friend. But she has ALOT of experience...and I...at the time had no experience at all. While I wanted to fuck her, I was also okay just being friends because as I said, she's a great friend...and those are hard to come by now days.
But anyway, she enjoyed that comeback...And that was thru text messaging
If you're face to face...with the right voice tone, confidence, and circumstance...if a girl comes up to you and hugs you and says "I miss you"....you can pull off that "I know." response...Depending how you play yourself...depends whether or not she will take it as arrogance, or a sort of playful teasing, or as "I know.....I miss you too".