Please nothing rude I just need opinions.

My boyfriend left today. I was kind of annoyed, I just wanted to clean and get stuff done so he left to get out of my way. Well he came back around 8:00p.m and said 

"babe do you have any black clothes"

I replied "well of course half my clothes black" 

"Okay well I need you to do me a favor"

 

Of course I said yes before knowing what it was, because I would do anything for him. Well beside that I'll carry on he asked me to help him steal his friends roomies pot plant 😓😓😓😓😓😓 I told him I was nervous but washed all my black clothes and waited till they were done. He started getting dressed and I said I can't do this I feel like I'm going to get sick I don't steal why can't you just grow one on your own. He babbled about how it's too late in the season and how he needs my help. I said explain to me what you have plained he told me all the details... I still said no. I don't want him to be mad at me but he's furious.. He said it was some kind of trust thing like do I trust him. I said trust has nothing to do with stealing what I gotta trust you that a cop won't roll up on us? I just I can't help but feel like maybe I'm a bad girlfriend maybe I let my anxiety get in the way idk I just can't stand he's mad at me he's not gonna let this one go. I just don't know what to feel.. Do you think I'm wrong for not going ?