I don’t trust my boyfriend, should I leave him?

In every other way he’s a great boyfriend, he loves me, shows me affection, always says he loves me. But i notice strange things about him. Like today a girl walked beside him to grab fruits. And then she walked to a different aisle and he went to that aisle after her. Another time he would stare at a girl infront of me. And he would smile flirtatiously at a waitress. He denies doing any of this but I see it with my own eyes. He says he only loves me but I don’t believe it?

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When I keep bringing it up, he says that none of it happened and I was imagining it or that I was overly jealous and it doesn’t mean anything
I don’t trust my boyfriend, should I leave him?
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