My boyfriend constantly gets jealous when I text other guys, but why can’t I get jealous when he texts other girls?

My boyfriend constantly looks at my phone and asks who I am texting what we’re talking about and why, but when Im not allowed to ask what he’s talking about to other girls, he has this cousin (who isn’t blood related at all and her name is Michelle) that he texts and I never look and ask what is going on I let it be. He does it to me all the time and automatically assumes I’m planning days to hang out with my guy friends when they are my coworkers and I ask how they are doing with their kids. Is that even okay?
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