Love song do you know if any songs like that?

Okay so.
Do you guys know any songs where the boy and girl are both in a relationship with other people, but they like eachother. ?
Do you know if any songs like that?

Maybe some here:
Celine Dion: The Power Of Love * Mariah Carey: Vision Of Love * Phil Collins: Groovy Kind Of Love * Michael Bolton: How Am I Supposed To Live Without You * The Doobie Brothers: What A Fool Believes * The Three Degrees: When Will I See You Again
LeAnn Rimes: How Do I Live * James Ingram: I Don't Have The Heart * Rod Stewart: Tonight's The Night (going to Be All right) * Fleetwood Mac: Say You Love Me * Genesis: In Too Deep * Bread: Make It With You * Linda Ronstadt And Aaron Neville: Don't Know How Much
The Chi-Lites: Oh Girl * Gilbert O'Sullivan: Alone Again (Naturally) * Frankie Valli: My Eyes Adored You * Chicago: Hard to Say I'm Sorry * The Honeydrippers: Sea of Love * Aaron Neville: Tell It Like It Is * Jennifer Warnes: Right Time Of The Night * Al Green: I'm Still In Love With You
Elton John: Your Song * The Temptations: Just My Imagination (Running Away With Me) * Captain Tennille: Do That To Me One More Time * Diana Ross And Lionel Richie: Endless Love * Amy Grant: That's What Love Is For * Jim Croce: Time In A Bottle
Elton John: Candle In The Wind * Captain Tennille: Love Will Keep Us Together * Diana Ross: Touch Me In The Morning * Peaches And Herb: Reunited * Neil Sedaka: Laughter In The Rain * Jim Croce: I'll Have To Say I Love You In A Song * Marvin Gaye: Let's Get It On
Whitney Houston: Greatest Love Of All * James Taylor: Don't Let Me Be Lonely Tonight * Kenny Rogers With Dolly Parton: Islands In The Stream * Eric Carmen: All By Myself * Barry Manilow: Even Now * Toni Braxton: Unbreak My Heart
Fleetwood Mac: Little Lies * Michael McDonald: Ain't No Mountain High Enough * Genesis: Invisible Touch * Vanessa Williams: You Are Everything * Michael Bolton: How Can We Be Lovers * Chicago: Look Away * Starship: Nothing's going to Stop Us Now
Percy Sledge: When A Man Loves A Woman * Rod Stewart: Have I Told You Lately * Chicago: You're The Inspiration * Joe Cocker: You Are So Beautiful * Natalie Cole With Nat King Cole: Unforgettable * Lionel Richie: Stuck On You * Taylor Dayne: I Will Always Love You
Top 100 Love songs, many with videos:
http://top40.about.com/od/top10lists/tp/top100lovesongs.htm

Well in the song Im Not Okay by My Chemical Romance the lead singer wrote it about a girl that he liked but she liked another guy. She ended up taking unclean pictures with her boyfriend, so that's the only one I can think of that is similar, and also you might want to check out Demolition Lovers by My Chemical Romance that's a love song too.

Why Can't I? by Liz Phair. I believe there is a line in there that goes:
Holding hands with you when we're out at night
Got a girlfriend, you say it isn't right
And I've got someone waiting too