I love my boyfriend and he treats me so well yet I always have such dark and negative thoughts that pop into my head to sabotage the relationship?

Why is this? I don’t ever tell him about those thoughts but I just wish I could just enjoy the love that I receive instead of my brain wanting to sabotage it? Some help/ advice or tips?
I love my boyfriend and he treats me so well yet I always have such dark and negative thoughts that pop into my head to sabotage the relationship?
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