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My new boyfriend is going away for 3 days with his bestfriend. The big problem is which I only found out is that his best friend is a girl. They will be sharing the same room. I just don't believe you can have such a close relationship with the opposite sex without one of you developing feelings. Should I talk to him? I don't expect him to choose but I feel like walking away from the relationship because I hate feeling this insecure.
I really do like him but my head is all over the place now. Is there anyone that has been in this position that can give me advice?

So my best friend and dated for 9 months. It was my first real relationship where I let all my walls down, so it was very hard to break up with him. His heart wasn't in it. We had No contact for 2 months. I felt like I had accepted everything to be and I started seeing an ex 3 months later that didn't last very long. some time after that break up, my best friend (the first guy) and I, we decided to be friends with benefits Our deal was to tell each other if we wanted to sleep with someone else and we'd stop. I soon realized I started having feelings for him again, I never intended to. So that went on for 2 months. He hung out with a friend Amy, I noticed he would text her often. Well he picked me up one day to get supplies for our party we were having at my place. while picking out liquor he gets a phone call from Amy and (this is my best friend I know when he flirts) i could tell it was a female and had an idea it was her. He walks a few steps behind me conversing with her telling her how he's not sorry for her being "sore", laughing and kept saying he wasn't sorry and he had to go because he had arranged to hang out with other friends this day and didn't want to be "rude". I had a feeling he slept with her. in the car I'm texting my roomate and he's texting Amy and his phone was positioned to where I could actually read what he was typing, he sent her "I can't really talk about my sex life right now". And that made me instantly nauseous. I didn't say anything until later that night after the party he'd been texting her all night right next to me. So Iconfronted him about it he said he was going to tell me, I told him I had feelings for him, I was heart broken had no contact with him for 2 weeks. We decided to stay friends but he kept bringing her up in convo w/me. I told him I didn't want to hear about her after what happened. Told him to put himself in my shoes said he would but kept acting as if normal I cut ties w/him, He says he did nothing wrong. Is he right?