Can my Boyfriend Apply for Cosmetic Surgery Financing but Use It for Me if Approved?

You will have to discuss this with the bank and be transparent with your distribution of funds.  If it is just a personal loan, the likely will have little concern of how you spend it.  Each practice has their own policy of how they finance surgery.  Usually payment prior to surgery is the most common.

Breast augmentation in a young woman who has had children is a very common and appropriate procedure, but I question the second part of your anticipated cosmetic surgeries--facial fat grafting. You look young and attractive in your photo, and except possibly for the nasolabial folds, I see nothing that would be benefited by fat grafting (except perhaps the surgeon's wallet!). Are you sure your surgeon is certified by the American Board of Plastic Surgery? There are lots of "bogus" boards out there that certify just about any physician who wants to claim Board Certification, but without the complete plastic surgical training, rigorous written and oral testing, and ethical requirements of the ABPS.

Other than those concerns, there are indeed financing options that reputable plastic surgeons' offices have available, including CareCredit and Med Loan Finance, among others. Best wishes on your new look and upcoming wedding!