<human>: Started around a week ago, my friend T(25m) lied to his gf(23f), when she asked our other friend J(26m), if T was lying, J covered for T.  But since I was witness to all of this, I was told not to breathe a word to Z(T's gf). they threatened me afterwards. 

They know that if Z somehow finds out, it will have been me who told her, since I was the only other person to witness this.

So I am kinda feeling up against a wall here. I like Z, I don't think she should be lied to, she deserves a man who will tell her the truth no matter what the consequences.  

 A few sidenotes;

T was guilty the whole time. 

T was only lying to not receive scorn from Z for being a lazy fuck.

Just something that's been on my mind lately. I want to tell Z about this but I don't want my bro's to fly off the 
handle so to speak.

Can you condense the text into three sentences or less?
<bot>: friend lies to girlfriend,  gets other friends to cover for him, accomplice(me) want to be truthful but don't want anyone to hate me.