It's not about the situation so much as it is about the person doing what THEY want.
Being alone or having a "friends with benefits" relationship are both "choices" of the individual. You are responsible for your own happiness. "When we change, our circumstances change."
If you are not doing what YOU want to do then you are living your life as a spectator. It's your life, take the wheel!
"The world may not owe you anything but YOU owe yourself the world!"