I (25F) asked my friend (25F) to seduce my boyfriend (29M) to see if he'd cheat.

It says it all in the title. My boyfriend and I have been together for 5 months now. I asked my friend, Nancy, to seduce my boyfriend, Sam, to see if he'd cheat or not. I have always had severe trust issues, which Sam is aware of. Even though I couldn't bring myself to trust him, I never tried to control him or force him into cutting of his friends or anything. I've kept my trust issues to myself and I don't share my doubts with Sam. The last time I told him that I can't bring myself to trust him, he got very upset, and I didn't want to upset him even more, which led me to just live with the constant feeling of worry and doubt. I have tried my best to develop trust, but I just can't do it for the life of me.

Last week, I asked Nancy if she could do it. Flirt with him and see his reaction. Nancy agreed and went ahead with it at a party I didn't attend purposefully. Sam wasn't aware that Nancy is my friend. He said that he thought that Nancy was the sister of one of my friends and that we didn't talk to each other.

Well, she did her thing, and Sam invited her back to his apartment. When Nancy mentioned me, he told her that I don't need to know, and that he'll take care of it somehow. She went with him and according to her, they both had a drink. He tried to make a move on her, so she made some excuse and left for the night.

She called me up next morning and told me everything that happened. I was expecting a mental breakdown, but very surprisingly, I felt relieved. For the first time, I didn't feel so paranoid and crazy, I felt as if I had been proven right for the first time.

That evening, I met up with Sam and told him everything. He denied everything at first, but he came around soon enough and admitted to it. He then started yelling at me that what I did was manipulative and disgusting.

I told him that I never manipulated him. I never forced him into anything, I didn't influence his behaviour, I never made him do anything. I just put him in a situation that he will encounter some day. He had a clear choice, and he made a choice to cheat. If not with Nancy, he would have cheated on me with some other woman.

It made him shut up for a while, but now he's been telling everyone about the whole thing. Some people are siding with me, some with him. It's 50/50.

The ones that sided with him keep telling me that I manipulated him, but I can't seem to understand how. I didn't make him do anything, Nancy didn't make him do anything either. He made that choice all by himself. He would have done the same if it would have been some other woman. How is this any different from his perspective?

I need someone to tell me if I'm the bad guy here, and I'd appreciate an explanation along with it because I can't wrap my head around it. I'm open to all opinions and criticisms, and I'd appreciate if you refrain from making hateful comments. Thank you in advance.

TLDR - asked a friend to seduce my boyfriend to see if he's cheat, he invited her to his apartment and made a move on her, she told me and I decided to break up, I told him the truth and he called me manipulative, I told him that I didn't force him into anything and he made his own choices, some people are siding with me, some people aren't, I need to know what I did wrong.