How can I be more trusting?

When I met my boyfriend I had the impression that he was a player because he kind of was. But since we started dating he has been so loving and kind and hasn‘t given me reasons not to trust him. The problem is that I still get suspicious so much, I always wonder if he‘s secretly flirting or something like that. I feel like subconsciously, I am looking for something to validate my initial impression of him. what can I ACTUALLY do to stop thinking this way?

How can I be more trusting?
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