<human>: I feel awful for doing this. The person I'm dating right now is absolutely wonderful - truly, a beacon of light. Our relationship of two years has been absolutely stellar.

On top of that, my partner is the most caring, considerate, kind, thoughtful person I have ever met. They have gone above and beyond anything I, or anybody else, would ever deserve. And they love me so, so much, I can tell.

And I just don't think I love them anymore. I have no reason why - everything about us is (or was) perfect, and then one day I woke up and the spark, the FIRE, was gone. Poof, vanished. 

I've spent a few months thinking about this - trying to isolate different viewpoints to see if it might be something on my end... but no.
We're just done, and they have no idea.

I don't know where else to turn to because this situation is so illogical. I can't even begin to explain how terrified I am of hurting my partner. I don't want this to happen, and I'm paralysed with fear every time I get the opportunity to end things.

Reddit, how the hell do you end a relationship when you have no good reason to, except, just KNOWING you need to, deep down? 
How do you hurt someone who doesn't deserve it? 
Where am I meant to pucker up the courage to do this when they have devoted and given everything to me?

Condense the text into a few key points
<bot>: Literal perfect partner, a saint. The spark is gone. I need to end it. I'm too scared to do so. Help.