Lots of good ones already mentioned. Here are a few that I can think of.
Carpenters - close to you
Eddie Rabbit, Crystal Gayle - Just you and I
Faith Hill - There You'll Be
Jim Croce - Time in a Bottle
John Michael Montgomery - I love the way you love me
Juice Newton - The Sweetest Thing
Lionel Richie, Diana Ross - Endless Love
Rascal Flatt - My Wish (excellent for one being away and helping others even if you're putting a different spin on the meaning)
Tracy Byrd - Keeper of the Stars
Kenny Rogers - You decorated my life (I think we fail to actually listen to these lyrics, they are truly gold)
Billy Dean - If there hadn't been you
Bon Jovi - Thank you for loving me
Bon Jovi - Always (really nice, but you would have to forgive some of the lyrics)
Bryan Adams - (everything I do) I do it for you
Faith Hill, Tim Mcgraw - It's your love
Eagles - Love will keep us alive
Exile - Kiss you all over (not even slightly close to sappy and romantic)
Fleetwood Mac - Wish you were here (perfect lyrics - I listened to this 1000s of times while growing up)
Garth Brooks - To make you feel my love
Gary Wright - Dream Weaver
Gretchen Wilson - When I think about cheatin (so pretty this is iffy though)
Hall and Oates - You make my dreams come true (if you want to mix up the sappy a bit)
Hot Chocolate (you sexy thing - again to mix it up if you're interested in that)
Jeffrey Osborne - on the wings of love
Jim Croce - I have to say I love you in a song (changes meaning a lot, but it's the way you are saying, I love you).
Leo Sayer - When I need you
Sammy Kershaw, Terri Clark - The love of my life
Enrique IglesIas - Hero
Hollies - The air that I breathe
Joe Cocker - You are so beautiful
John Denver - Annie's song