en_tn/rev/02/04.md

I have against you the fact that

"I disapprove of you because" or "I am angry with you because"

you have left behind your first love

To stop doing something is spoken of as leaving it behind. Love is spoken of as if it is an object that can be left behind. AT "you have stopped loving me as you did at the beginning" (See: rc://en/ta/man/translate/figs-metaphor)