does this mean anything? I find myself being real insecure

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My girlfriend and I have been goin out for a few months. Were both pretty crazy for eachother. She can be a real playful girl sometimes, not flirting, I dont no maybe it is flirting. She says she loves me and I think she means it. But often times I find myself being real insecure about our relationship. And its hard to trust her. Then I will ask her about it and she says " do you honestly not trust me?". What does she mean by this?