hey mate. I understand how u feel. But trust me if it doesn't happen then it never will. U have to loosen up. At first it might be hard and u might get jealous of other people that talks to this person. U might even start blaming ur self for not loving and holding on hard enough. However later on, u will stop caring as much as before, it might take time, but evantually u will not care anymore. move on u deserve better mate, ik its hard but I promise u will feel way better when u let it go.
never chase someone. love yourself first. we can't force someone to love us. if you feel unlove walk away. you deserve so much better.