I think what you want is way more important than what he wants in this situation. I tend to be kind of cynical when it comes to last name stuff though.
I gave my son his father's last name when he was born, despite my mom advising me otherwise. His father was only around a few years and then skipped town. I loathed being called "Mrs ExBF", and it happened all the time. One day my son asked why he didn't have my last name and expressed that he'd really like to. I waited several more years, but eventually went through with changing his name, which was costly and time consuming. Most people don't even realize he ever had a different last name now. He, my family and I are all much happier now and I wish I had listened to my mom initially, or even just was willing to put my foot down with the ex.
Basically the point of that was, if you want to be Dr maiden name, then that is what you should do, because if you ever get a divorce from current BF (not that you will, but it happens) you may really resent being Dr married name, and it will be a pain to change it over (from what I was told by a vet that got married after vet school.)