Why does my boyfriend get upset when I go hang out with my friends?

Anonymous
My boyfriend and I have been in a relationship for almost a year now. We live together and we spend most of our time together. However, it seems like every time I mention spending time with my friends or I make plans to go do something with my friends (which is maybe once or twice a month) he gets upset and tells me "well I didn't think you were gonna stay out all night" when I'm home by 10:30 or 11:00 p. m. or he says that I care more about seeing my friends than I do him. I'm getting really tired of feeling made to feel guilty for wanting to see my friends especially when I have never stopped him or gotten upset with him when he goes and hangs out with his friends. I want to sit down and have a talk with him about it before another argument happens over it but I'm not sure how to start the conversation. I don't want him to feel like I'm attacking him but I do want him to understand what I'm saying and not get defensive. This is literally the only thing that we ever argue about. He really is a great boyfriend and treats me like a queen. I just want him to not freak out or get upset because I want to spend time with my friends.
Why does my boyfriend get upset when I go hang out with my friends?
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