Is it wrong to put money in a savings account to protect it from financially irresponsible spouse

My husband spends money as soon as he gets it. I handle all of the finances because he isn’t capable of holding on to a penny. My husband is the primary source of income right now. I started working part time when we had our youngest 1 year ago. As of right now I pay all of our bills as soon as we get paid because if I don’t he will end up spending our money on BS. Every time we sit down and talk about our finances he promises that he’s gonna do better with saving, but it never happens. We have nothing in saved up for emergencies. If he knows we have anything saved he’ll use it on for something ridiculous. It’s like money burns a hole in his pocket and he just has to spend it. Other than his compulsive spending, he’s a great dad and husband. I really don’t know what to do. We both work hard for our money and I would like more to show for it. As our kids get older I would like to take more family vacations and put them in extracurriculars. Lately I’ve been thinking about putting money away from each check into a separate savings. I don’t like the idea of lying to my husband but I feel like I have no other options.

Would I be wrong?