Kate has ব্যক্ত I প্রণয় you, but to Kevin the guy she married.
She hasn't ব্যক্ত I প্রণয় আপনি on screen to Jack অথবা Sawyer. In the episode "Every Man For Himself" she ব্যক্ত "Yes I প্রণয় him!" when asked দ্বারা that 'other dude' while Sawyer was being beaten to a pulp - though later in the episode Kate then takes back what she said.
Kate has not ব্যক্ত I প্রণয় আপনি to Jack on screen, but it's pretty easy to assume from their time together off island with their engagement that she must have ব্যক্ত it to him at some point, we just haven't seen it. It's also fairly easy to assume that she is still very much in প্রণয় with him, looking on her actions in season 5.
HI LISTEN AT THE END হারিয়ে গেছে THE 6TH SEASON SHE ব্যক্ত TO JACK AT THE LAST EPISODE KATE HAD TO GO TO THE PLANE & LEAVE JACK SO SHE SAID:"TELL ME I'M GOING TO SEE আপনি AGAIN AND THEN SHE KISSED JACK AND SHE ব্যক্ত I প্রণয় আপনি & JACK TOO.IT WAS THE LAST EPISODE JACK DIED IN THAT EPISODE ON THE ISLAND BUT THEY ALL LANDED IN LOS ANGELES CAUSE JULIET COULD BLOW THE BOMB & everybody landed in the los-angels at first they couldn't rem ember each other but then they could & jack & kate were together (jack + kate) so this is truth because it was 1 মাস অথবা 2 months পূর্বে the finally
HII!! No, Kate has never ব্যক্ত "I প্রণয় you" to Jack (unfortunately), but he already ব্যক্ত it to her in the end of season 3!! Kate has, however, ব্যক্ত "I প্রণয় you" to Sawyer in the last episode of season 4, when Sawyer was about to jump the helicopter. :/ As a jater I think she was carried দ্বারা the moment, she probably thought she would never see him again, অথবা that he could die...