The worst part is that you are the one that ends up getting hurt because you cared too much. How fucked up is that? Whether you want to establish a friendship, a romantic relationship or even grow a relationship with a family member, you need to make sure that it is worth it and that they care about you too. If you suspect it's not or that they don't really care, just leave because it will only hurt more if you stay. And don't forget about those people who have been there for you during the good and the bad. Those people are the most important.