I believe that romance leaves less time for music. There are other "interesting" activities in which you can participate when you are in love.
As a guy with a Masters degree in Psychology, I believe Freud would say that music can be a sublimation for other basic drives (like sex and companionship). That just means when you don't have sex or companionship, you may compensate by putting your energy into something enjoyable, like playing music.
Don't fret. We change. Sometimes I look back on my time alone when I could record all of the local folk music radio shows (all three of 'em)and then review them an make tapes of the songs I enjoyed. I could also stay up half-the-night learning a new song to sing and play. All of this has gone by the board since I met Marge. However, I have not deserted music. I play guitar and sing most every day. I perform regularly (including music).
Consider it a fair exchange. I have no intention of giving up Marge or music. If either demanded the desertion of the other, I would have to let one go. And it might be either.
Roger in Baltimore