do u think i have to send sms to this boy just to say "HI!"?

he's my childhood friend before,but when were in highschool we got so quiet with each other til this time. when i got a vacation from abroad, whenever we saw each other were both shy to greet each other til i left again. hes not in a relationship also,and my friends and cousins tell me maybe he likes me too,but just shy to tell me.But how,because im now working here in abroad?