Part 1 - Relationships
Relationships are like winning the lottery; you never know how much love and loyalty will you succeed. You give the relationship your best, but the other person doesn't bother or care enough. You'd do anything for the person, but they'd barely do anything by themselves in return.
You may love someone endlessly, however, what is your love for if the person can't appreciate it? What is your passion if the person doesn't care enough? You gave someone your heart, and they returned it broken.
You knew they're going through something, so you excuse them, but then the pain became unbearable. Wishing you were strong enough to hold on, now having to let go is an even more significant pain. Especially if you do it to protect yourself, not wanting the pain anymore, nevertheless, after getting rid of the person, the pain gets even worse.