This is Tim's version of Ben and Tim's love story, an opportunity to see what went inside Tim's mind. & heart. 
 In Something Like Summer, Tim is the manipulating asshole who breaks Ben's heart repetitively and even tries to ruin Ben's wonderful love story with amazing Jace. Tim is the guy who finally gets Ben after Jace is conveniently killed. After reading SLS, I found it terribly unfair that Tim could have the Happy end Jace was denied. He appeared like a thief. 
 Now, after reading SLW I still want Jace to have the happy end with Ben. It's confirmed (if there was any doubt): Tim really IS and asshole (what did I expect?). But I'm not mad at the end anymore because I now feel more pity than disgust for Tim.