Life has taught me that u can't control someone's loyalty. No matter how good u are to them, doesn't mean they will treat u the same. No matter how much they mean to u, doesn't mean they will value u the same. Sometimes the people u love the most, turn out to be the people u can trust the least.
Sometimes, when people decide to leave you for good, you have to let them. No matter how much you don't want them to.There are some things that are far beyond our control. Even if you have the strength to fight for them, you have to accept the cold harsh truth "The people that you can't live without, can live without you."
I don't think it's worth the time and effort to fight because if that person's mind is made up they will leave you been there tried to make it work but to no avail don't go wasting your title and energy it won't help rather focus on getting better and stronger so that they can see what they have lost.