Am I considered a "rat" if I was ignorant of street codes? How can you hold someone accountable for something they are unaware of?

Make a long story short,

Overseas in Germany(serving in the military), I ran across a big time distribution drug dealer. I didn't know him forever, just met him to grab a bag of weed here and there. My homie I was smoking with actually got caught smoking by failing a drug test and that brought in the Feds. Basically an automatic thing. So of course he pussied out and ratted on me. Putting me in the chair for interrogation, I had them convince me outside of the laws and regulations. I didn't give them the information they wanted, only what I knew they were going to find out once they stripped and tapped into my phone. The paperwork got back to him of course, but I'm curious what was on that paperwork? Because if he read it well enough, though I wasn't able to explain it to him the way I wanted because we had to fight upon first sight due to high tension of the matter, he should've saw that I wasn't trying to throw him under the bus right? They would ask me questions like where, when, and who, and the fact that it was in my phone, and they ****** me over, like a dumbass I told. But questions like is he a drug dealer, etc, I said no. I don't even know his real name. I don't even know where he lives. I don't even know what car he drives. Upon his trip to court, did his lawyer lay it all out for him? Could the lawyer have helped him understand this guy really didn't try to have him set up?

Thanks guys!