We've Gone Where We Should Never Have Gone

This is my problem. My roommate and I have been living together for three years. This last year, stuck in our apartment, working from home, not being able to go out, just the two of us day in and day out. We have really messed up, we are sleeping together, we've had sex with each other. We aren't even gay. We went to my parents' over the holiday. We slept in my growing up bed, and made love, in my parents' house.