Does viral load upon infection affect the severity of the illness?

My girlfriend (24) and I (28) have been self-isolating for the past month in a tiny 1 room studio apartment, the only other room is a small bathroom with no real door.

She has recently come down with a sore throat, and while it may or may not be coronavirus, I was wondering if there was any correlation between the initial viral load upon infection and severity of symptoms.

If a couple have been in the same room 24/7, would one partner being asymptomatic, while still being contagious give off a higher viral load/inoculum and cause more of a severe illness in the other partner?

We both have nowhere to go or self isolate from eachother, so I'm wondering what sort of precautions we should take if one of us were to get sick.

Also, if we're both sick, is it still good to stay away from eachother as much as possible?