Friendship problems...?

I have a friend, a guy and he alwaiz says that me and my other friend are his besties..but i never rily believed so. Last day of school, everyone was signing shirts, he didn't get to sign mine but he signed hers saying 'i love u so much..ur my bestie' nd wen i saw him later on at his house where our group hang out..he signed my shirt, i signed his saying' love u so much..ur my bestie' nd he signed mine saying 'love u..never forget that' ? was a bit baffled cos he wrote sumink diff for her..lyk does he care more about her than me? or was it cos he wrote hers in the moment, when every1 was gettin emotional bout leaving school nd he wrote mine lyk hours later..i srsly dnt knw..shud i jst ask hiim?