Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: For some background, I live with my brother while he's getting his feet under him and I'm getting my masters degree. He is 27, I am 22. He has been dating this girl "Liz" for about 6 years and she is about to come unglued waiting for him to propose and he claims that he's just not ready yet. 

About 4 months ago, my brother found my Tinder account and he and his friends basically catfished the shit out of me using pics they stole from Instagram. I was an idiot and I fell for it, hook line and sinker. I wanted to get revenge on him some how but wasn't sure. 

The week before Valentines day I was in B&amp;N and saw this book "How to Buy Diamonds" on one of the endcaps. I saw my chance so I bought the book. On Valentines morning I stole my brothers phone, turned it off and watched him stomp around the house which in reality was a pretty good prank. He went to work without his phone and since I was home all day, I "hid" the book in the stack of crap my brother keeps on the coffee table and at like 4 I texted Liz and said basically "Bro lost his phone, he wanted me to text you to come over now if able so he can take you out." She texted me back and showed up maybe an hour later. 

I made sure the binding of the book was plainly visible and let her in. I said I had to study in my room and closed the door. I could hear her flipping through a magazine and then about died laughing when she called her sister or friend and said something like "he has a how to buy a diamond book! Oh my god. Do you think it's tonight? Oh my god! It has to be tonight. It has to be! I call you back as soon as it happens!" I literally couldn't contain myself I was laughing so hard. 

So bro got home, they went on their date. Maybe 2 hours later they came back through the door screaming bloody murder at each other. Obviously he hadn't proposed and she was screaming at him why did he have a "how to buy diamonds" book if he wasn't going to propose. He was trying to talk his way around it all because she was furious with him. Finally she dug the book out of the stack of stuff and threw it at the wall. My brother obviously knew it was me at that point but Liz didn't care and said she needed a "break" to figure out if the relationship is really for her after 6 years. As far as I know she hasn't spoken to him in two weeks. 

For my brothers part, he understands that I was just getting back at him and he admits it was a pretty good joke but he is truly, truly broken hearted over Liz possibly breaking up with him over it. I feel really bad but at the same time I didn't make her freak out. 

Am I the asshole for doing it?

playing a revenge prank on my brother and his girlfriend on Valentines day