It's wonderful that you want to protect your daughter, but I doubt she will just take what you say as the truth. You might try sitting down with her and explaining that "things" have been brought to your attention, and you wanted her to have the information. Explain that you did not ask for the information. It was given to you and you are just passing it on for her to do whatever she wants. People are often blind in relationships and need answers just laid in front of them so they can "discover" them on their own. No good parent wants to see a child hurt, but we all have to respect any decision our adult children make, and that's often very hard to do.
Since she didn't know, the real key will be her behavior. If her behavior remains the same, stay with her. If not, the money has made a difference in her feelings.
It's NEVER impossible, but it is hard. Seek professional help from someone who has experience in these type of situations. I've had several similar cases, so I know how hard it is on both people when others are tugging on them.
Things can always be worked out if that is the true goal of both parties. That being said, it requires an extraordinary amount of work and commitment.
There is no one right answer. It was a gift, so most people understand that. There have been many court battles over this. Generally, it's still considered a simple gift and not an arrangement.
Explain your reasons honestly. Just because she drinks more than YOU think, does not make it a fact. It may be that you can't be with someone who drinks more than you should. You'll have to see what unfolds.
It's not that he didn't trust you, it's that he wanted to factually trust you. You should do the same. In this day and age, it never hurts to have as much information as possible in relationships.
Unfortunately, the world has become so polarized, you can no longer make certain comments, even if the intent was innocent. Your comment could, with certain people, be thought of as a gender-related microaggression.
WTF? Is he living in the 1950's? You need to start setting boundaries. Let him do his own laundry, make his own meals, etc. Basically, go on strike with EVERYTHING.
If she can't do it herself, do it together. Don't do it alone. You won't get anywhere.
It doesn't make any difference whether or not you like her. You should not have to pay for his gift. He's old enough to take responsibility but evidently not mature enough. This should be a lesson for him.