Hopefully, it means she likes the way you make love with her. If you feel the same way, it's a good idea to tell her that! If you think she's just "being polite," tell her you want to make it as good for her as you can and she should tell you if she wants to try anything different.
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When she says you're a good lover, she likely means that you provide emotional connection, prioritize her pleasure, communicate effectively, and show attentiveness and consideration during intimate moments.