Ex gave ds money for Xmas and ds has saved it, and added to it by also saving all of his pocket money, so that he currently has a good amount saved. He has been considering spending some of it recently but so far hasn't.
Ds lives with me and sees ex once a month (exs choice) and I look after his savings for him.
Ex has just texted me asking lots of questions about ds savings, how much it is, is he saving for anything specific etc, and how much did he give ds for Xmas (I don't know - he also gave the other dc random amounts of money and just transferred a lump sum to me for them all which I shared out into their savings at the time but didn't keep any record of - I just keep each dc current total updated as the money sits in my account because they are too young to have their own yet)
He has then said he has received an unexpected utility bill and he has to borrow the money from ds but ds mustn't know about it. He says he can get the money from his own savings at the end of the month and will then pay ds back. He is demanding £150 tomorrow and says that it is his money because he gave it to ds and ds hasn't spent it.
I'm very reluctant to do this because
A) it is ds money and I don't think doing it behind his back is right
B) I don't have the money myself so if I lend it to ex and then ds wants to spend it he won't be able to until ex pays it back - which would be very unfair and basically penalising ds for having been sensible and saving his money
C) ex has form for being very unreliable re. Money. He was financially abusive while we were together and also borrowed thousands from my parents which he has never and will never pay back
Surely his utility company would be open to waiting until the end of the month for him to pay if he explains that he needs to give that much notice to withdraw the money from his savings account?
AIBU to not feel comfortable lending ds money in this way?