I know (or read so xD) that fade ends when you initiate an attack but will fade end if you cast spells like buffs/heals or can you keep fade up until its duration end even if you cast non attacking spells such as buffs/heals?
Yess you can cast, unless it has some kind of interaction like heal dmg and other form that makes enemy aggro…
EDIT: Want to add that statues doesn’t disable fade even though some can aggro,because the statue itself isn’t an attack and the aggro isn’t directed at your character
thanks for the response 
i wanted to go full support build so i will just be running around healing/buff and such so i think i will max out fade