AITAH for “breaking” a school cello

ok so what basically happened was one of my orchestra classmates put his cello on a stand and forgot to latch it in and it was like leaning on its side leaning on the wall. When i went to put my cello away i stepped back and accidentally stepped on the stand so the stand came upright and then the cello just fell off. Its pretty much totaled now, the fingerboard snapped and then strings are all broken. Its a school cello btw. Ill admit I probably should have looked backwards before stepping back, but am i at fault here? Not sure if this is the right sub to post this on but it seems to be ok. Thanks!