I LOVE Alice and Jasper.
More then Edward and Bella.
They are so amazing.
The way they met, It just floors me. So here's Alice waiting for this man that she has never met yet knows everything about. She just, naturally saw that he was going to be the love of her life and has been sitting in the dinner who knows how long waiting for him to show up.
Then there is Jasper who walks into the dinner and see's this tiny little being. He's mentally and emotionally knocked off his feat by her and has no clue what to do with himself. Naturally, he becomes putty in her little hands but though it sounds bad it was the best thing that could have ever happened to him.
They walk out holding hands and from that point on they just are together.
It's honestly just so beautiful to me. I've played it so many time sin my head...
And yes, Alice saved Jasper but she needs him just as much. He is her rock, her reason. Her "Alice, are you thinking about this all the way" and "Alice calm down, don't worry" that saves her from herself. I always
assumed that's how it was but BD solidified this. (and it's such a subtle moment, don't laugh at me...)
Alice, is so spazstic and perky. She also throws herself into everything and takes it upon herself to worry and fix every problem that may or may not have anything to do with her. It's not usually a problem cause in 95% of the cases Alice is MORE then capable of fixing every problem. I mean she knows every possible way that everything CAN happen and with smarts and money at her disposal how hard is it to prepare for all these possibilities?
Well in BD she was having a problem trying to figure out what to do about Irina and she just could not let it go. It was one of those 5% cases where she had no clue what to do and she was turning into a neurotic little freak because of it. Fixing and re-fixing Esme's perfect garland and all that. The looking into the future and being disappointed for seeing the wrong things, worrying about it, frustrating herself over it...
Jasper knew EXACTLY what she was doing, WHY she was doing it, and told her she shouldn't worry about. An understanding no one else (well, MAYBE Edward but just cause he knows doesn't mean he understands) could have so quickly. He also helped her calm down in his special little way because Jasper is amazing and useful in his own right. (though when he's gone they all forget about it

)
Of course we all know what happened next and even though she was able to fix the problem that's not the point. 
Contrary to possible belief I know Alice can not do EVERYTHING and when she's having trouble remembering that herself Jasper is there for her. It's a gradual thing, a more subtle thing, but an equally important and touching thing to what Alice did and does for him.
<3