Ladies what to do if you think your man likes a woman at work?

So my boyfriend of 7yrs hates his job well least that’s what he always told me and would always fight with me if I even ask what he did today or how his day was. He’d literally yell at me and argue. Told me he’s not fucking staying there etc. well recently a girl started working there and now he seems all content with his job and all smiles and doesn’t care to look for another job. And I don't know I just feel like he’s into her or something. Am I crazy? Or overreacting? His job has only been dudes til she came. He works for a bottle manufacturer.
Ladies what to do if you think your man likes a woman at work?
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