Okay so yes this dude was a F boy but at the same time they kind of set him up. What if he wasn't a total tool and was kind and sweet to both? What if both roommates started catching feelings? There is nothing wrong with anyone on a dating app talking to multiple people at the same time in my opinion. You're not committed to someone so have fun and see what's out there. I mean he was basically two different people to each and that copy and pasting of messages was incredibly dumb. So he deserved to be called out but I wonder how many times this has backfired on the roommates?