The thing that connected grass and erosion is that the existence of grass would PREVENT erosion because grass strengthen the soil composition on top of it. Dam is created in order to direct flowing water from rain into a space provided especially to store it, which will PREVENT flood.
just try to move on. ik its not going to be easy. or just ask her for an explanation of her actions. ik what it feel likes. its really bad and it just eats the persons mind up.
or just do the same like she is. u also try to date sm other gurl and make her regret her decision for leaving u