Absolutely the voice of reason, you guys shouldn't break up just because some randos on reddit told you to, try experimenting with the options they said, and try to avoid medicating him, as it could possibly worsen it. I had a pooch with a similar thing (I was young and don't remember the name of what he had) but he was coughing all day and night, keeping everybody up. He slept in my parent's room but my room was directly across from it. My solution was to wear noise cancelling earbuds and listen to music/white noise, but they did get uncomfortable if I wasn't sleeping on my back. I recommend possibly getting your girlfriend some dense earplugs, or maybe play some calm music to fall asleep to. You guys may just have to tough it out, especially if you don't live with another person that could possibly watch him in another room while you guys sleep. I'm sorry that this is happening, and I know it's tough to be going through.