She is still cake eating and probably will be until the ink is dried on the divorce decree. It seems that she values you as a wallet more than as a man. And she is getting scared that the ATM isn't going to work for her in a few months. So she was intimate with you, probably as a well to test if you are still wrapped. Or maybe she was just randy. Who really knows how these waywards think.
Just be careful with your heart. I can tell, and so can she, that you still care for her. If you can detach and and see sex as just recreation then perhaps you can continue doing that. I can't do that . . . it muddles up my thing something fierce.
I'm a man . . . But I can change . . . If I have to . . . I guess . . .