alone. Anyone that is reliant on having a gym partner with them never ends up making any real progress.
For one, when you're with a partner, you're taking a longer time to do less actual work because you're busy taking turns and/or chatting about bullshit between sets, and just not focusing on your workouts in general. More importantly, it leads to a bad habit where you need your partner in order to have any motivation to go. So much more common to end up bailing just because the other guy couldn't make it for whatever reason. One guy has an excuse to quit, and suddenly now both of you have an excuse not to go. It's like having a permanent set of training wheels on, or never learning to go out into the world on your own because mommy held your hand 24/7.
That said it's good for gym noobs to have a gym bro when starting off to help them nail down form and show them the ropes. Problem there is that MOST lifters are DYELs themselves who don't know proper form for the major lifts anyway, so wouldn't be of any help in this regard.