should i add this person on Facebook though we were never really friends?

[L]

so i don't know if how i know this person warrants me adding them on Facebook or not or if it would just bother them ..long story short as a kid *7-12* *am now 18 i was obsessed with the yugioh card game and always went to tournaments at my local card shop a worker there*in his early 20s* who was in charge of the shops games section was more of a professional player * meaning he went to the big championship level events and sutch * truth be told i guess i idolized him he did help me get better and was always really nice anyway he quit working at the shop around some point though hes driven past me a few times and waved hi at me ..apart from that he seemed to have vanished anyway i found his Facebook and im not sure if i should add him since we were never really friends at most just acquaintances