Should I continue sharing a flesh-light with my roommate?
What's a flesh-light? Why are you sharing it with your roommate?
It looks like a flashlight but it has a hole where you can stick your dick into. It's a sex toy for men
You shouldn't share sex toys with others. It's unsanitary.
I see no harm in doing so.
You could easily pass along STDs and other infections. Don't be dumb and be sanitary when using sex toys.