Love phrases

I like you suki desu
I love you (more serious) Aishiteru
Do you love me? (care for me?) Boku no koto suki? 
Do you love me? (more serious) Boku no koto aishiteru?
I (female) am in love koi ni ochichatta.
I (male) am in love koi ni ochite shimatta. 

You are beautiful kirei da. 
You are handsome hansamu ne. 

I am passionate about you kimi ni muchuu. 
You make me happy kimi ga ite shiawase. 

Will you marry me? kekkon shite kudasai. 
She’s my fiancé boku no kon-yakusha desu.
He’s my fiancé watashi no kon-yakusha desu.

You are the love of my life. watashi no isshoo no koibito.
I adore you kimi no koto sukide tamaranai.

I miss you aitai. 
I need you anataga inai to yatte ikenai. 
I always think about you itsumo omotteimasu. 

Would you like to be my boyfriend? booi furendo ni natte kureru?
Would you like to be my girlfriend? garu furendo ni natte kureru? 

I want to be with you forever. itsumademo issho ni itai. 

Kiss me kisu shite. 
Hug me daite.