The Sense of an Ending by Julian Barnes ***

Tony is remembering his first girlfriend from back in the 60's.  He's retired now, divorced, & rather confused when he gets an inheritance from Veronica's mother.  Why would he get 500 pounds from his ex-girlfriend's mom 40 years later?  He soon finds out it has something to do with his friend Adrian. After Tony & Veronica broke up back then, she started dating Adrian.  A few months later, Adrian killed himself.  Is Tony remembering the past correctly?  And what is the past, if not what we remember? 
Overall, this was a great book.  The writing was excellent & it read quickly.  You tend to feel Tony's confusion along with him, & you can become very emotionally invested in the outcome.
That said, there are two things about this book I didn't like.  The first is something that has happened to anyone who reads. You've heard of a great book, everyone says it's the wonderful.  So you get it & read it.  And you just don't quite get it.
That happened to me with this book.  It has a twist at the ending & I understood that.  But there was an aspect of it that I just didn't grasp, & it's not because the author didn't supply it, it's because sometimes I just don't get the obvious.  I don't want to give away the ending, but it's so hard not to & properly discuss this book.  So I'm going to make an announcement:

SPOILER ALERT!!!  PROCEED WITH CAUTION!!!

OK, so in the end we find out that Adrian killed himself because he'd gotten Veronica's mother pregnant.  Alright, I get that.  But what I fail to grasp is why Tony has anything to do with that.  There's the implication that maybe he somehow encouraged it in his angry letter to Adrian when he found out he & Veronica were dating.  But I don't see how that has made him some sort of accomplice to the whole affair.  I just don't get it, so if you've read this book & you understand what the heck is going on, please leave a comment & tell me!
The second thing that upsets me is the portrayal of Adrian's son.  He obviously has a developmental disability of some sort, but lame approach is taken that this is a horrible tragedy.  I guess I'm tired of seeing people with those types of disabilities as being tragic figures.  They can be tragic, don't get me wrong, but not because of their disability.  The only tragedy that I saw was the fact that a young man would rather kill himself than deal with impregnating someone, even if it is his girlfriend's mom. 
And that brings me back to the first problem--why would she leave money to Tony? 
I think I better just leave it there & start reading a new book!