Most Helpful Guy
When you've had your heart broken too many times, you have no feelings. All those nerves and sensors that could cause you pain have been burned out from over-use, long ago. You're prepared to accept the worst from people, and it's no surprise when it happens. You know that you can't trust people further than you can throw them, no matter who they are or what you've done for them.
At your age, I doubt you'd have enough experience to reach that stage.
Play them as you see them, and don't waste much time going over the past. Learn what you can from it, if there's anything to learn.
Thesedays, when things end, I just go out and get banged ASAP and don't look for reasons that aren't there. I'll listen to this, too, because it gets me back on track.