Loss of personal microbiome?

Greetings Dr. Armpit,
I'm an East Asian male and have lived with little to no odor all my life, with a very active lifestyle since childhood. It has been a few years since I moved in with girlfriend and my armpit odor has changed for the worse. What can I do to regain my own smell? It almost makes me feel like I lost a part of myself now that I stink.