['My friend borrowed a book from me, but he went and lost it! It was one of my favorites too', "Oh that's terrible.  Did he say how he lost it?", "Yea, he accidentally left it out in the rain. So of course it's no good anymore"]
Do you remember the title?  Maybe you can get another copy.
My friend borrowed a book from me, but he lost it. It was one of my favorites and it's not so easy to replace