What does WL stand for in texting?

In texting, WL stands for "with love".

According to GlobalRPH's Texting Acronyms, WL is one of many common text abbreviations.

Here's a brief overview of some other texting acronyms that start with "W", also from the same source:

It is important to consider the context of the conversation when using or interpreting texting abbreviations like WL. "With love" is a generally warm and affectionate phrase.