What do you blame the tear on? Drugs? Intensity? Form?
Just curious. You've experienced my greatest fear.
Good luck on your recovery, man.
Looking back, I'd blame it on being severely overtrained. I hadn't taken more than 2 days off from training since I was 15 years old (I'm 21 now) when I broke my arm. I took exactly a week off before I got pissed and cut my cast off so I could lift.
I rule drugs out because I could bench 405 when I was 17 before I ever touched a drug. The whole idea with drugs damaging tendons is nonsense. If somebody was a newbie to training and just started juicing the day they started training, they may run into problems due to the muscles getting stronger than the tendons can keep up with.
It wasn't form either because this was actually my biggest fear also, so everytime I benched, I thought about it. I always use nice and slow controlled reps and sort of let my elbows come in to my sides on the descend instead of creating right angles with my arms at the bottom position to take pressure off the tendons.
I guess I would recommend never doing over 405 for reps because no matter who you are, your tendons are probably not going to be able to handle that kind of workload on a weekly basis. Or maybe they will. Who really knows. Good luck.