husbands ex is his cousin?

my husband ex wife is his 1st cousin. they were together for 10yrs, middle to high school sweethearts. he told me that in their culture, its good, kind of like a blessing to be married into the same fam member. as long as you two arent bros and sis. i find this messed up and it makes me feel uncomfortable w him hanging out or staying the night w his other female cousins. or im just being insecure and overthinking?

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