<human>: Me and my boyfriend have been together for nearly 16 months and we have a great relationship. We explore a lot of different things when we have sex like roleplay etc but the other night he asked me to tell him about a time I had sex with another guy in detail. He said it turns him on. I did it but then he asked me to actually have sex with another man in front of him. I don't mind exploring this as a fantasy but I'm unsure if this would be damaging to our relationship if we actually did it. He also wants me to have sex with someone when he's not here and then tell me about it and send him pictures while we are doing it. He knows I don't want him to have sex with other girls and he's fine with that. Just before we made it official that we were together I had sex with another guy while we were sleeping with each other (just not officially together) and he was very angry about it at the time but then he told me a few days ago that it turned him on and he wanted me to explain it in detail even though it happened over a year ago. 

I am enjoying this as a fantasy while we have sex and just talking about it but he has been cheated on by nearly all his ex girlfriends so I'm wondering if this is something to do with it and why he wants me to do it. I don't want to damage our relationship. He insists it won't but I can't believe it because of his past relationships.  

Also I know this is a fetish called cuckold.

Give me the gist of the text in a nutshell
<bot>: boyfriend wants me to sleep with other men while he watches but he was cheated on a lot in the past and I'm scared this will damage our relationship?