|  | hmmmm 
 the exact translation is PISTA DIKOS (male) DIKH (fem) SOU, PANDA
 
 Now, the best translation depends a bit on the context.
 
 If it is to a friend then something like "O PANDA PISTOS/H PANDA PISTH SOY FILOS/FILH" (your always faithful friend)
 
 or "O FILOS/H FILH SOY GIA PANDA" (your friend for always)
 
 or "O PISTOS OPWS PANDA FILOS SOY" (your faithful , as always, friend)
 
 for a boyfriend/girlfriend
 
 "gia panda DIKOS/DIKH SOY  (yours for always)"
 " >>>>>> opws panda (as always)"
 " """"  , panda (yours, always)"
 
 I'd go with
 your friend for always
 and/pr
 gia panda dikos/dikh sou
 
 but that's a matter of preference (up to a point)
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