What does it mean that my boyfriend wants to hang out with his brother Friday night instead of me?

Anonymous
My boyfriend idolizes his older brother. I'm happy they have a good relationship but I think it's weird that on a Friday night he wants to hang out with him instead of me? Sometimes I feel like he ditches for him? Should I worry? Shouldn't he want to hang out with his girlfriend on a Friday night?
What does it mean that my boyfriend wants to hang out with his brother Friday night instead of me?
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