Is this pyscho of me to message a woman asking if they’re sleeping with one another?

Im dating this guy and currently pregnant with his child. I have my suspicions on this woman where he’s liked ALL of her photos, I’ve seen her on his phone and they follow each other on every social media. He is telling me he’s not sleeping with anyone else, it’s not just me being bitter but I have a gut feeling he is and I don’t want any STDS. I’ve asked him if he’s seeing her and he has said no. Is it pyscho for me to message and ask or does this give him a feeling of being trapped.

Is this pyscho of me to message a woman asking if they’re sleeping with one another?
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