The movie is a movie that has as a Theme song that is "Just Once" that has a boy that sold all his items to help a girl in an operation then the girl leaves him and goes with another guy. Came out in the 1980's

"The Last American Virgin"
It's really about this young man, but there is a girl he is in love with. She gets pregnant, the guy is a jerk, so this poor guy helps her by getting her an abortion. At the end, she goes back to the guy who got her pregnant. Great 80's movie and teen movie. All kids should watch this movie.

Yes, the movie is called "The Last American Virgin."