How do act around him?

[Maira]

me and this guy, lets call him "d", went to the same high school. at that time i was a junior and he was senior. we didn't know each other and we still don't. i didn't know he liked me intill i started noticing him every where i went in school. it seem that we only talked through our eyes. i dont know i cant describe it. is like we connected. we had one mutual friend, lets call him "b", which i asked him to asd d if he like anybody but d told b that he did not. after that d still was around but not as much. i added him on a social network thinking that he will talk to me. i sent him a note saying that i have notice him looking at me and that we should talk. a week passed and he didn't write back. so i started to make it seem like i was moving on with a relationship trying to make him jealous and talk to me. but that backfair when he started posting pics of him and this girl together and kissing her on the cheek. he took me out of his page and then weeks later he deleted his page and when to college. naw i have found him again and i have been checking his page and i think he knows but i'm not sure that is me. because he said something about people checking his page 24/7. naw recently i have found out that he's at that the same college that i'm planning on going. the campes is not that big so i think we could run into eachother. if we do run into each other how should i act around him?? what should i say if he asks me about what happen?? oh and he's a gemini with venus in taurus and i'm a sagittarius with the moon in capricorn if that helps. i really need help please!!!!