Why did my fuse not blow?
Even fast fuses don't respond immediately after the rated current is reached. Most fuses require a significant over current to fire almost instantly. This is an obvious requirement since its all about heat, and minor heating (a raise ambient temperature) shouldn't affect the fuse too much (or at least not cause it to "blow"). 

Judging from the data-sheet, your 100mA fuse should blow after about 80 seconds @215mA @25°C.



How long did you wait?