Honestly, if this was the other way round, and a man was the higher earner and controlling the finances, while the woman working on a low wage had no say in what happened to any extra income coming in, the answers given by many of the PPs would be completely different.
I do understand that the OP has been burned before, but marriage is about sharing, about helping each other, about seeing each other through the difficult times. For me, the situation here would depend on whether the DH was working full time, or part time and picking up the slack at home. And whether he has the ability to get another, higher paying job, or if he's just looking for an easy ride. We don't know, because the OP hasn't said.
It sounds fine, if one partner is earning less, and the other is paying all of the bills. This, on the whole, may well mean that things are fairly equitable in the amount that each has for 'fun money' etc. . But where it becomes more difficult is when one partner is making the financial decisions, without discussion. They get to decide what is invested, what is spent on holidays etc just because they are the higher earner. This definitely can lead to a power imbalance, and that's not good for a marriage.
In this particular case, I can totally see why the money went back in to savings, as that is where it presumably came from in the first place, and the relative said they want to pay for the holiday.
But it's still fair to discuss this, rather than making the decision for both of you. It's fair to discuss any financial plan, including savings, spending, budgets , pensions etc. Not necessarily having complete access to all money (although I do think that's best), but being open to discussion. That's how most people in a successful marriage function. It can work without this, but I think it's rarer. If you are open about finances, and operate in a way that you are BOTH happy with, then that's good for the long term success of the partnership. If not, it can lead to resentment - possibly from him because she makes all the financial decisions, possibly from her because she doesn't trust him or think he's bringing an equal amount to the marriage (not just financial, but in effort).