I've read a few things that seem to conflict and am interested in others' thoughts.

Reading all the ex-back posts (this is not why I'm here btw) people say, and are encouraged, that of course they can have their ex back.  Then I read that you need to be able to walk away when you realise someone is wrong for you. (I'd probably agree with that - I don't understand why someone would seek to reattract, say, a bully, serial cheater or someone who disrespected them) - but don't people tend to believe LOA can change people?  

Also, I've read that anything is possible with LOA, it is a law and therefore immutable. But so is the law of gravity and changing that would be a paradox wouldn't it?