What does it mean when someone calls you "Sick" ?

mangue
My sort of ex boyfriend just wrote to me: your a sick girl. What does he mean? He has said that to me a several times even when we where together and everything was fine. This time we discussed why we broke up, see the thing is I've accused him for cheating so he told me how tired he is of me believing everyone else instead of him and that he actually really used to like me.

So what did he mean considering the context?
What does it mean when someone calls you "Sick" ?
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