What is Lily's big revelation in Book 5??? Help!

[ghinghapuss]

No: HPFGUIDX 77976

I know this has been discussed before and I'm raising it again in the 
hope that 2 months of digesting OotP has shed more light on the 
subject.

What is the `something' we find out about Lily in book 5?  Her hating 
James Potter?  (Rowling herself said something would be reveled about 
her in book 5 and even more in book 7.  If anyone out there knows 
where and when and what the exact quote by JKR is could you let me 
know?)  

The only new thing we learned about Lily that I can find was that she 
hated James Potter in their 5th year in school.  Not very unusual and 
very understandable considering whom he was at that time. She 
obviously changed her mind later as she marred the boy and had a 
child with him, according to James' friends that happened sometime 
during their 7th year of school.  I can't count the amount of times I 
changed my mind about boys when I was in secondary (high) school. 
That, in my opinon, is not much of a revelation.

Are we to then assume she didn't in fact change her mind?  If not, 
she then married him out of duress or necessity?  I don't think so. 
Why? Let's see:  Duress?  Well children's lit is full of beautiful 
princesses being forced to marry evil Kings, although usually they 
are rescued just in the nick of time by their true love. So I suppose 
it could be possible, but all the photo's Harry has seen of his 
parents they both look very happy so I don't think so. Duress through 
an arranged marriage?  Possible between two Pure Blood family, 
especially as the WW still seems to exist in the 19th century anyway, 
but Lily's family are 20th century muggles, so I don't see an 
arranged married there.  Ok so we are left with necessity, which 
deals with teenage pregnancy.  Happens all the time, but is still a 
big taboo in our society and I'm not sure it would show up in JKR's 
Harry Potter books. Even if it did it implies, through her choice to 
slept with him, that she liked him, even just a little bit so what's 
the big deal with her hating him a couple of years earler? Sorry I'm 
rambling on tryng to find a clue.....

Is there another revelation that is hidden and I've just missed?  
Please help.

Mandy