I think he's cheating, but what if he isn't?

I've been seeing my boyfriend for a few months now, exclusively for three. He works at a coffee shop with this girl that he was seeing casually before he even met me. We've talked about it a little bit, but he assured me that what they had was just a fling and it's definitely over. I want to believe him, but he gets really weird when I talk about visiting him at work. He says I would "distract him" even when I suggested I come in during a slow hour. He's also very secretive about his phone, which almost feels too cliche to be a red flag. He never opens texts when he's around me and takes his phone with him whenever he leaves the room. Should I be worried about this girl from work or am I just paranoid? I don't want to mess things up by accusing him of something he didn't actually do.

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