What does it mean xx at the end of message ?

bob01
this is not about dating, is just about a message I exchanged with a woman, who happens to be single, and who used "xx" at the end of message.

It did receive messages signed similar before. Does it mean anything ?
Updates
+1 y
it proved that the woman who send me those messages was manipulative. ITS just a warning for guys to open your eyes wide!
What does it mean xx at the end of message ?
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