あなたがいなくて寂しいです。
I strongly feel the loneliness without you here.
I feel lonely when you aren't here.
I'm lonely without Tom.
I'm lonely without you too.
I feel bad that you aren't here.
Without her I am lonely.
I miss you so much since you are not here.
I'm lonely without you too.
私だけは、あなたがいなくて寂しいです。