My friend is moving =[?

this boy i really like + is my friend is moving,i really like him + will miss him so much,and he`s only been here 5 months,ive cried so much over him,and for what him to leave,theres been a bit of bad times and good times but now..he`s leaving,and this girls hu`s his best mates sister told me,so i cant tell him or any one anything,so i dont even know if he will even say goodbye to me or anyone,i dont know what to do.