Why would a partner constantly say you don’t love them?

My ex use to say this to me often , she would say you don’t love me , or she say I just accept the fact that you don’t love me? When i never once said those words to her , so why would a partner say that to you, if you never said those words? I finally had it with her and said to her , Keep telling yourself that , so you can continue doing whatever it is that you are doing behind my back. Because you clearly are up to no good and trying to justify your actions. To come to find out , she was up to no good with her girlfriend. What would you do , if your partner kept saying that to you?
Why would a partner constantly say you don’t love them?
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