First of all, does D know how you feel about K?
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I've never actually been in the same position as you are now but I have had friends who will not back off a guy that I have a huge crush on. A few years ago I fell head over heels for this guy. A year later my exbestfriend moved here and decided she liked him as soon as she found out that I liked him (about 3 months after we met).
She would always jump up to be partners with him in class and hang around him.
It wasnt really till one of my other friends sat her down with me that she realised how I felt.
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sometimes some people dont really realise whatr others are going through and you just need to make the most of the time you have left with K.
Also, he said he would never like you but I think based on what you have been though with him things have changed a bit.
You could even try telling him how you feel about him again. This times things might turn out better.

And if you to are fated for each other than you will defiantely meet again in the future wink