Was my boyfriend eyeing up my cousin or am I overthinking it?

We were going to a family party and my boyfriend kept looking at my cousin, who is very pretty. She was wearing a dress and he kept looking at her legs. I think. Or am I just being paranoid? It’s the first time I’ve noticed something like this, we’ve been together nearly 2 years 😭😭

Was my boyfriend eyeing up my cousin or am I overthinking it?
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