My ex and I have known each other for ten years. We dated for five years, grew apart and broke up (but stayed friends), and are on the verge of getting back together. We've been through a lot, and I truly love and care for him. What's keeping me from fully committing is something he shared that happened when we weren't together. 

Basically, he had a couple of threesomes with a different GF and his brother's then-GF. When he initially told me about this (long before we worked on getting back together), he seemed almost proud of it. He shared details with me that I wish I never knew. His brother doesn't know, of course. Unfortunately, I do. It disgusts me, not because he had a threesome, but because it was with his brother's GF. I'm not sure if I'm overreacting or what. On the one hand, the past is the past. People can grow and change. On the other hand, I can't help but wonder: If he's capable of doing something like that to his own younger brother and keeping it a secret from him, what could he do to me?
user
My potential boyfriend is secretly eskimo brothers with his own brother.
assistant
My ex and I have known each other for ten years. We dated for five years, grew apart and broke up (but stayed friends), and are on the verge of getting back together. We've been through a lot, and I truly love and care for him. What's keeping me from fully committing is something he shared that happened when we weren't together. 

Basically, he had a couple of threesomes with a different GF and his brother's then-GF. When he initially told me about this (long before we worked on getting back together), he seemed almost proud of it. He shared details with me that I wish I never knew. His brother doesn't know, of course. Unfortunately, I do. It disgusts me, not because he had a threesome, but because it was with his brother's GF. I'm not sure if I'm overreacting or what. On the one hand, the past is the past. People can grow and change. On the other hand, I can't help but wonder: If he's capable of doing something like that to his own younger brother and keeping it a secret from him, what could he do to me?
user
I'm curious what would happen if he ever got back with his ex-girlfriend.
assistant