Phineas sat silently in the backyard, watching his brother going away with her.
It had been so stupid of him to hope. To hope she'd see him, she'd even care. Of course she didn't love him, what was he thinking? Ferb was perfect. He was nothing.
But he couldn't help it. When he saw her, flirting with Ferb, shy, and so cute - it broke his heart.
So he sat there, crying. Isabella wouldn't love him, never. There was no reason to carpe diem anymore.
With one last glance at the pair, he cut his throat, and died.

FERBELLA GET LOST!

OMG PRICELESS! XD

Love the surprise ending.

You should definitely continue this, it's great!

That was great. Ferb is my favorite character.

O my goodness! Please continue, that was amazing!

That was cute! Please continue!

I think you write very well, but I never like songs stuck in stories like this, and I don't know how to describe it, but the words are very stop-and-go, which reads really weird if not set to music. Ok, I just don't like song lyrics in stories, period. Also, the Candace part has typos.
I like that it was Candace watching. I wouldn't have guessed it was her. If I was going to continue this, I would start by rewriting this chapter.

Hey ProteusGrayson! I love this story so far! Please make another chapter! By the way, you made a spelling mistake.

Candace decided to leave her brothers alone for the day. A sort of reimbursement to Erb for spying on him in the first place.

You put Erb, not Ferb. Anyway, hope you update soon, this is one of the only good Ferbella stories and I hope you wish to continue it. Surprisingly there is only a small amount of Ferbella stories, but you still make the top in my book!

Bella

Please update soon, please make this a multichapter story