You may say 'anata ga inakute sabishii,' written: あなたがいなくて寂しい
2nd one
there is no differnece !
aitakatta
Miss you
tangata babe
Nic and Rocco
Anata o ketsujō shimasu
Miss Dowell
Mrs/Miss/Ms Natasha
Mr/Mrs/Miss/Ms.
Anata ga inakute, sabishii desu.
Watashi wa anata ga inakute sabishii