You want an "I miss you," just really picture it in your mind. Then laugh it off and move on about your day.
It's really that simple. People just get caught up in time, details, then mess up that visualization by believing it won't happen, or freaking out and making the Universe take its time. It really is that simple!
Picture it. Laugh to yourself. Have fun with it, don't stress over it. Totally don't care if you get it <-- the hardest part. Move on about your day.