Background: Franklin Joseph Lymon (September 30, 1942 - February 27, 1968), known professionally as Frankie Lymon, was an American rock and roll/rhythm and blues singer and songwriter, best known as the boy soprano lead singer of the New York City-based early rock and roll group The Teenagers. The group was composed of five boys, all in their early to mid-teens. The original lineup of the Teenagers, an integrated group, included three African-American members, Frankie Lymon, Jimmy Merchant, and Sherman Garnes; and two Puerto Rican members, Joe Negroni and Herman Santiago. The Teenagers' first single, 1956's "Why Do Fools Fall in Love," was also its biggest hit.
Context: In early 1957, Lymon and the Teenagers broke up while on a tour in Europe. During an engagement at the London Palladium, Goldner began pushing Lymon as a solo act, giving him solo spots in the show. Lymon began performing with backing from pre-recorded tapes. The group's last single, "Goody Goody" backed with "Creation of Love," initially retained the "Frankie Lymon & the Teenagers" credit, but they were actually solo recordings (with backing by session singers). Lymon had officially departed from the group by September 1957; an in-progress studio album called Frankie Lymon and the Teenagers at the London Palladium was instead issued as a Lymon solo release.  As a solo artist, Lymon was not nearly as successful as he had been with the Teenagers. Beginning with his second solo release, "My Girl", Lymon had moved to Roulette Records. On a July 19, 1957 episode of Alan Freed's live ABC TV show The Big Beat, Lymon began dancing with a white teenage girl while he was performing. His actions caused a scandal, particularly among Southern TV station owners, and The Big Beat was subsequently canceled. There is no surviving footage because the episode was taped over, according to Judith Fisher Freed.  Lymon's slowly declining sales fell sharply in the early 1960s. Within the span of one year, as a result of heroin use, and the deepening of his voice to a baritone as a result of going through puberty. His highest-charting solo hit was a cover of Bobby Day's "Little Bitty Pretty One", which peaked at No. 58 on the Hot 100 pop chart in 1960 and which had been recorded in 1957. Addicted to heroin since the age of 15, Lymon fell further into his habit, and his performing career went into decline. According to Lymon in an interview with Ebony magazine in 1967, he was first introduced to heroin when he was 15 by a woman twice his age. In 1961, Roulette, now run by Morris Levy, ended their contract with Lymon and he entered a drug rehabilitation program. After losing Lymon, the Teenagers went through a string of replacement singers, the first of whom was Billy Lobrano. In 1960, Howard Kenny Bobo sang lead on "Tonight's the Night" with the Teenagers; later that year, Johnny Houston sang lead on two songs. The Teenagers, who had been moved by Morris Levy to End Records, were released from their contract in 1961. The Teenagers briefly reunited with Lymon in 1965, without success.
Question: Why did the group break up?

Answer:
In early 1957, Lymon and the Teenagers broke up while on a tour in Europe.