Is the cheater worse than the friend that cheated with them?

I've been single and had no interest in any date for several years, lived a quiet life, low profile for the longest until I did something wrong way back in Feb. My friend's boyfriend and I fooled around. It wasn't intercourse (I stopped him when he wanted to proceed to that) but the other things.

I know this was completely wrong and we've made a deal to keep quiet about this. He expressed regret afterwards and doesn't want to lose his relationship. At the same time, I don't want to lose a good friend. Wouldn't he (the cheater) be worse than me?

Is the cheater worse than the friend that cheated with them?
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