You've got to make things clear!! Have the talk!

First month anniversary? Is that a thing now? An anniversary is yearly.

This is why you always ask them if they want to be your girl/boyfriend; to make it all official and clear.

Whatever it is, it's better than just friends without sex.

OP: At least you got sex! ;-)

I know that some things may seem obvious, but different people draw different conclusions. Whenever any sort of change in relationship is initiated, communication is key to ensure that all parties are on the exact same page, and not just assuming they are.

That should also be "friends who split the check."

Ah the dreaded "friends with benefits zone"

Maybe you had the "we're in a relationship" conversation in your head.