After a point, you get tired of chasing people. You stop wasting your energy on those who aren't aware of just how much you love them, and who aren't willing to commit to your relationship. In the beginning, while you did go the extra mile for these people, eventually, you notice how futile it is do as much as you do for someone who barely acknowledges or returns your feelings. Over time, you learn to safeguard your moments for someone better. Instead of fighting with the idea of staying with people when they make you doubt whether they're worth your love, now you choose to let go. You establish, quite honestly, that you no longer intend to exhaust yourself over people who act like they're completely okay with losing you.