Hey Tessa,
I don’t know if what I am going to say will help you or not but I hope it will.
Honestly, your head is in the right place. You’re acknowledging what you need to acknowledge and you seem like a very bright girl.
Of course, it’s going to suck adjusting to life without a partner in crime and without someone whom you can turn to as soon as sh*t hits the fan. But once you’ve fully adjusted, you’ll have experience living with your bestie and experience being independent. Then, you can truly determine which lifestyle you prefer and which is better for you.
If you like living with someone, you can find someone to live with. If you like the independence, you can choose to remain alone.
My advice would be to just stick it out for a bit, then adjust according to how you feel after giving it a fair shot.
It just sucks right now but we all have to endure at least a little rain before we can see the rainbow.