Translate this HINDI for me pls?

Woh hamare KDD the....She/He was my KDD (don't know what the abbv. stands for)
Jo begane ho gaye.........who became someone else's

Thodi si baat thi...............it was a small matter
K fasane ho gye...............that became a story

K ussne ilzaam diye (or is it kya usse ilzaam de?)...what allegations she/he put (what allegations should I put...is kind of rhetoric question)
K sunava hal-e-dil.............What do I tell of my heart's condition

Koi hoga naya....................Must be someone new
hum to purane ho gaye.......We (I) have become old (hence discarded...implied)

Sorry.