I wonder

Wed 27 Jan I visited ex's house after receiving text message from her that D had "hand, foot and mouth" disease. In front of the children ex said to me in an aggressive tone that I should be paying half for the medical costs for the children. She then went on to say that she had paid for my missed appointment fees at Medical Centre to the amount of $120 and that if she had not paid those fees that I had incurred D would not have been able to see a Doctor. Thu 28 JanI transferred $60 to ex account to cover her costs for unpaid fees. Send ex email saying I had done that and asked for receipts - thinking that I will get proof she had paid before giving her all the money.  Thur 11 Feb I contacted  medical centre today to inquire as to whether I owe money for missed appointments. I was told that there is no record of  any unpaid missed appointment fees for me. The only record of a missed appointment fee is for $30  that I incurred in 2007 and  Medical Centre record shows that it was paid in 2007. The Practice Manager suggested to me that maybe ex was trying to get money out of me. I wonder....