idk if you guys will answer this...but i'd appreciate some help:-)

so i have this guy friend & we're pretty close. i'll like say "i love you" & he'll say "i love you too" but whenever i say "you're my BFF" (jokingly of course) he never says anything?? he just changes the topic or something or pretends like he doesn't hear it. i thought he might not have heard it the first time so i didn't really worry about it but then i've said it a few times recently & he hasn't said anything about it? does he not want to be my bff??
(my best friend thinks that he likes me & just doesn't want to be friend-zoned but i'm not so sure since it doesn't seem like he likes me?? idk sometimes he'll "accidentally" try to hold onto my hand or he'll always find some way to touch me [not in a bad way]).
i just want to make sure that i'm not bugging him by calling him my BFF? i don't mean it seriously (like how i don't mean to say i love you in a very serious manner) & yeah. you probably get my point by now haha. :-)