The kit isn't kept for sentimental reasons. He will use again.
Yeah. You violated his privacy. He also set you up. Sorry. If he wanted to hide it better, he wouldve. Period... "whatever you do, do NOT look in there"... Really? How often does THAT ultimatum work?
So why did he set you up? To test whether you would respect his personal space?
To test whether he was respecting your brothers house and personal space?
To test whether you were passive enough to put up with his sh!t? Or to see if you would push him?
Honestly, I don't care. And you shouldn't either.
He used. He will likely use again. You get to choose what you want to be around... And the crap you put up with shouldn't depend on how much you like a guy or how cute he is... Sorry.
Ive done my fair share of damage in the past with substance abuse. I have some perspective. If you stay, knowing that he is likely to use, you choose this. You cannot make him quit, you can't keep him clean off of whatever drugs you deem unfit... But you can choose what you do with you.
I just don't know how you cannot expect him to not eventually put that needle in his vein.