trip him in the hall and then be all like "hi"
If you supply me with a time machine, maybe I can remember. I need to go back about 45 years.
Don't be all in his face all the time.
Give him some space
Be all like giggling and then like blushing and then like playing with your hair and then like drop your books and then like it doesn't matter after that so long as your all then like first
The giggling is cool but don't do it in groups or to often as its kind of annoying and very awkward, take it from a middle school guy