i dont love you like i did yesterdayyyyyyy

This might help the not knowing what feels you're feeling. I have some like this from recovery. They can be pretty helpful.
http://www.paulelmore.com/wp-content/uploads/2012/03/Primary-Feelings-Chart1.jpg

I've decided that I don't want a relationship. I want an extreme friendship

on multiple occasions has my sister pulled the "that's not a good enough excuse" when I refuse to get my photo taken because she can tell when somone feels uncomfortable and I'm clearly not that uncomfortable with the situation.

THE TITLE IS NOT OKAY I PROMISE

Writing tip #1374 is really good advice just saying.

My boyfriend needs to understand the "I'm not comfortable" phrase.

"instead of a love triangle try doing literally anything else"
yes please

The writing tip really depends on the writer, sometimes it can good(e.g: Hermione, Ron, Lavender) and sometimes it can be really bad(e.g: Bella, Jacob, Edward).