No question that she is using you...she is now a single mother in need of support, and she is scared!!! Perhaps her behavior is a pattern considering you are her second (at least) failed marriage, both with children involved!!! Sounds to me as though she is emotinoally & financially insecure not to mention, immature!!!! I still concur that you maintain your separation while remaining a part of your son's life....good luck, mate!!!

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I wish all the ladies were pies on the shelf...and I was the baker because I'd eat them all myself.
I wish all the ladies were potholes in the road...and I was a dumptruck because I'd fill them with my load.