how can i tell her i ddnt mean 2 hurt her?

i have a best friend that i knw for 4 years now..
n we are in the same skool..n recently an old best friend of mine moved to our skool.. n i really missed her so in the break i go with her a lot..
but my other best friend thinks that im ignoring her n i over go with my old best friend..
all of that is her saying but ive been told from another friend.. NOT HER...
but i ddnt mean to hurt or ignore her..
n she seems fine with it.. cuz if she was hurt ..
y wont she tell me??
y would she tell sumone else who iz NOT me?!