So my friend's been going crazy suddenly, wanna cut all our(my other friends) relations with him... He said he's gonna kill himself if were to ever talk to him(which i know it's a bluff).. So any thoughts about this? *sorry if i post this in the wrong board*

People don't just change for no reason. Even if it's all sudden and you don't know why, there has to be a cause for the change to occur. If you know why your friend is "going crazy" then you can help him.

ask him why....
or give him time, i know it sounds stupid and probably will end in that friend distancing themselves from you all, if that happens is it such a bad thing?, but could lead to him realising his mistake or miss the possibly expected attention, and finding your group again
whichever it ends up as in that situation depends on the friend, weather they are one, or not. Which, i think, is apt.