Sorry?

How can somebody know if you are really sorry, maybe you're just saying it out of compromise, just to feel better about yourself for the horrible thing you did.
When and how do you know when people are REALLY sorry, when they truely mean it?
I just believe that sorry it's a word that was created so that people felt better with themselves.
Like a girl who gets laid with her best friend's boyfriend. She might really be sorry for that, but just by saying sorry and asking for forgiveness, that'll just make her feel better; becuase i'm pretty sure she enjoyed it when she was fucking with her best friends' boyfriend. One tip: do NOT blame the alcohol!

One of these sorry/forgiveness examples also happens a lot in church. When people go into confession they come in and say, "I had sex with my cousin", they are just being plain HIPOCRATES because when she's being absolved by "GOD" she will just feel better with herself, and maybe when the remorse it's over she'll simply do it with another cousin, or whom ever she chooses to fuck with, she'll just go back in to confession and feel better about herself. Hipocrate bastards.