Internet, but not on a dating app.
Social media and skype.
Know her since january 2014, we met in real life with a bunch of other e-friends in april 2014 (basically, those people knew each other since early 2013, I got introduced to them online because my best friend was part of that online group chat), but we started to really talk a lot on december 2014.
From february 2015, we started to flirt, and we started dating on april 2015.
We live together since september 2017, it works really well.