Boyfriend seems excited by female study partner?

My boyfriend studies every day with another woman. The other day she said it was going to be her birthday the following day so she will miss the session and he told her happy birthday in advance and arranged to meet the day after. So on the day of her birthday he told me she put a story up on Instagram and he was going to tell her happy birthday again. I told him it might be abit much as he’d already said it to her previously and he said ok I’ll wait until we next study session to say it. It just made me feel weird as he was so excited to say happy birthday to her.

I notice out of everyone he studies with it’s her who he’ll ask more questions not related to work to. I see her liking his photos on social media a lot.

Am I overreacting to be uncomfortable?

Boyfriend seems excited by female study partner?
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