<human>: My boyfriend and I live together now, but were dating long distance about a year ago when we mutually decided we wanted to have a threesome with our friend [31F] who was moving out of the country. We did, it was good, and she moved. Eventually though, I got this feeling that something wasn't right.

A couple months later, she flew back to visit her family and got coffee with my boyfriend while I was at work. When I calmly addressed my concerns, he told me that nothing was going on with her and called me crazy.

A couple months after that, I still had that lingering feeling. I was on the computer we both use, clicked through a couple folders...and found dozens of nude photos that my boyfriend (who's a photographer) had taken of her a day or two before the threesome. I'm so hurt, mainly because he lied to me when he said that nothing was going on. He apologized profusely, I left the house for a while, and after a lot of thought, I decided to return and give him a second chance.

He says if the situation happened the other way around, it would probably be too much for him and he would leave the relationship...yet he doesn't believe what he did constitutes cheating since they didn't do anything physical. With this said, he's treated me very well since this happened and he's given me full access to his phone and social media accounts so that I can see for myself that he's not doing anything with other women. He constantly asks what he can do to make me feel more secure.

I can't seem to get rid of the occasional feelings of doubt, resentment, and lack of trust though. I'm afraid that if I let my guard down, he'll do something else. Is there anything he (or I) can do to help me shake this? Would counseling be helpful, or does it seem futile?

Thank you for your help!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Boyfriend took nude photos of woman that we had a threesome with and didn't tell me, I found them on his computer, our disagreement about whether this constitutes cheating makes me feel insecure about our relationship.