Why can he go out but gets upset when I ask?

Hello everyone! I’m 6 months postpartum with my third baby. I had a baby Sep. 2020 and Sep. 2021 so I was kind of deprived of being able to go out and have some me time. My fiancé can go out whenever he pleases without hesitation or any worries about the kids because he knows I’ll be watching them and coming at 12am-1am. My friend asked me to go bar hopping this weekend with her of course after 2 years of not having a single drink I was excited and he got upset and threw a fit. Is this suspicious behavior and should I be worried about this?
Why can he go out but gets upset when I ask?
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