Does watching others do wrong things and doing nothing.. make you an accomplice?

I became friends with these 3 girls after a deal was made. I stole our teacher's USB and gave them the answers of several exams. I secretly returned it afterwards and the teacher has been suspicious about how both of them got the perfect score several times but can't prove they cheated. That was the condition to become their friends and they would stop being on my case. I literally pleaded for that friendship, that I'll just anything if they can just leave me alone.

I'm realizing it's not making me happy. They wrongly framed someone (getting that kid suspended; false accusation) and I stood there in silence, doing nothing. I just go along whenever they select someone else as their target. I know they're fake friends and it's wrong what they're doing but feel trapped. I don't want to go back to be ostracized again nor the outcast.

Does this now makes me an accomplice? I never laughed at the mean things they do nor at their jokes. I don't find anything funny. I just don't stand up for anyone, even if they're in the wrong. I just followed them.

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They are popular girls that really control a large crowd at school. It's either being an outcast (and targeted) or being within their group, not going against them.
Does watching others do wrong things and doing nothing.. make you an accomplice?
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