I don’t trust my girlfriend how do you deal with doubts like this without ruining the relationship?

I'm constantly overthinking everything, what if he's hiding something or not being honest with me? It's tiring because I don't want to accuse him of anything but these doubts keep coming up. I feel like if I bring it up too much I'll push him away but ignoring it just stresses me out even more.

I don’t trust my girlfriend how do you deal with doubts like this without ruining the relationship?
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