I‘ve been longing to see you.
How I long to see you.
I wanted to see you terribly.
I can't wait to see you.
And some quotes about longing if you wanted to be super poetic :P
“They say when you are missing someone that they are probably feeling the same,but I don't think it's possible for you to miss me as much as I'm missing you right now”
― Edna St.Vincent Millay
“Sometimes when I look at you,I feel I'm gazing at a distant star.
It's dazzling,but the light is from tens of thousands of years ago.
Maybe the star doesn't even exist any more.Yet sometimes that light seems more real to me than anything.”
― Haruki Murakami,South of the Border,West of the Sun