How to bring up husbands needless spending

Hello lovely women...I am gonna post this anon because I know my sil is on this app and don't want her to potentially see this.

So me and my husband had a joint checking/savings but we also have personal accounts from before marriage. We share all our money but kept them just because. Mine is a rainy day account that does not get touched while my husbands is his direct deposit from work (his company uses that bank so gets his paycheck cleared sooner) but we move money around or whatever as needed. We don't do the my money/your money thing. Well he needed money moved fast to cover a car repair so I had to link his account to our joint account credit union to transfer money. When I linked them it linked his account and his credit card through the bank. Come to see he has spent about a $1000 on a cell phone game since October. We bought a house in Sept and have a baby on the way and 2 kids under 4 so I have been trying to budget end save every penny I can to get ready for baby and revamp our account after down payment all that. Plus my husbands hours got decreased with covid so money has been tight. He has always been overly connected to his phone but this just kinda confirms he might have a cell phone game addiction ad he knows how tight money is and still can't stop. I know he is gonna be super angry when I bring it up because he will be embarrassed so seeing if anyone has any ideas or suggestions on how to approach this. He is a great dad and husband, very kind and has always been respectful so this is so out of character. He doesn't gamble, buy other things, etc just this cell phone game.

If I need to answer questions or clarify I will add an edit to stay anon. Thanks for any help ladies.

Edit: to answer answer some posts. No he doesn't go to anger usually but we have also never had an issue where he has lied, hidden anything, or really "messed" up in the 11 years we have been together. I just know he tends to get upset when he makes mistakes at like work as he doesn't like making mistakes so that is why I am hesitant.

He doesn't spend money on much else but right now we are living paycheck to paycheck and I have full placenta previa so this birth could already cost more in the end. I have had to budget to the cent with bills and food and have made it work but since last June we have had no extra income to spare. The money he spent could have been a carseat for the baby and going towards delivery. Normally I would not care as much if he spent money on whatever but right now i am cutting our lives to the bare bones and spending hours a week at night finding sales and coupons just to stretch money farther. When his hours go back it will be fine but that won't be until the vaccine is available to everyone who wants it and in our area they are saying june or july. Until then we are just getting by. But I have cut every expense possible. We have no tv, we don't go anywhere, no coffees out, no fast food, have gotten our food bill to about $150-200 for a family of 4. Kids clothes are from 2nd hand stores right now. I was even walking dogs and baby sitting while my kids are home distance learning to make extra but can't mow due to the previa. That 1000 could have helped us so much.