You didn't just get up and walk away from them. You stayed for a very long time. You waited for them to treat you better. You gave them time to fix their behaviour towards you, and you loved them for as long as you could. It was when you could no longer deny how miserable they made you feel, when you had to accept that they didn't intent on making an effort for you, only then did you choose to leave. So don't let them make you feel like your relationship ended because you gave up on them. You didn't. You left because you grew tired of waiting for them to start appreciating you. You left because it was about time you accepted the reality before you.