girls I need help...

Sarah
Please don't judge me... I love my boyfriend. I trust him with all my heart. He is 20 and is in the airforce. We are both waiting to leave for basic. Well his girl friend before me was his best friend of 6 years... they were only together a month. But they both say they aren't going to let a little one month relationship get in the way of their six year friendship. I understand it. Any time they hang out he takes me with him. He tells me if I'm not comfortable then to tell him.  But last time she got drunk she sucked her best friends boyfriends dick.. I don't know. I trust him but I don't trust her... I also don't want to tell him how I feel because I don't want him to think I'm being a bitch.. 
UPDDATE!!!
 First off thank you so so much to everyone who commented. You guys really helped me out. I just told him that with me leaving for basic after New Years that I was worried. He asked me why and I told him about my trust issues with his ex/ best friend. He kissed my forehead, said that he loves me, and that I am his life partner.. That I am the rest of his life, the mother to his future children, and his happiness. She isn't, so it's not an issue if that's what I want. Sorry for all the sappiness, I'm just happy on how things went. Thanks girls for all your kindness❤️

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