I would raise one issue you haven't mentioned--college. Remarriage can really mess up financial aid, especially at private colleges but also at some public ones. Rules change, but look at the net price calculators at a few colleges that might be of interest to your D to see whose income counts. Some colleges assume that your new H and your ex's new W will contribute to the cost of your D's education. The University of Virginia, for example, does include the income of both custodial and non-custodial parents in determining aid.
https://sfs.virginia.edu/financial-aid-current-students/current-undergraduate-students/financial-aid-basics/determining-need#:~:text=Divorced%20or%20Separated%20Parents%20of,based%20on%20their%20financial%20ability.Your BF might not be willing to do that, especially if he has his own children and especially if they are younger.
Whether your ex can be forced to pay depends upon your divorce agreement and the state where you reside. Find out what your situation is before you contemplate remarriage.
I know I sound like a killjoy but if your BF has a high income, being married might mean drastically reducing the aid your D is eligible for.