"Loving you is like walking on burning ash.
I feel like I'm being pulled out to sea.
Now I see your scheme in our years past."

My only suggestion would be for the second line to have a comma instead of a period, just so there isn't always a stop all the time, but just a short pause. I love the simile in the first line, very original. Good opening so far..

"You have caused my life to crash.
Now my heart is broken because of you and the missing key.
Loving you is like walking on burning ash."

Well-expressed emotion, I am enjoying this write.

"Within my life you have left a gash.
Why couldn't you just let things be.
Now I see your scheme in our years past."

I like the repitition, it has a nice effect.

"Everything horrible happened in a flash.
Please listen to my plea.
Loving you is like walking on burning ash."

Maybe add another word or two in the second line for better flow, and to describe more.

"My love for you will forever last.
Please stop torturing me.
Loving you is like walking on burning ash.
Now I see your scheme in our years ash."

Good ending, 4/5 from me.
Take care and God Bless!

~MaryAnne