Because Esme was dying after tring to commit suicide, so Carlisle wanted to save her by changing her into a vampire...and he saved her because Esme was Carlisle's 'Tua Cantante' (just like Bella was for Edward). According to SM Carlisle and Esme met when she was a 16 year old human- he was a vampire (he treated her for a broken leg.) She never got over the experience of meeting him and neither did he because as soon as he recognized her in the morgue (after her attempt of suicide) he decided he couldn't let her go again. You know how once a vampire finds love; has found his soulmate...Esme was Carlisle's soulmate and he found her after almost 200 years alone. ♥ That's why he bit her.
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Carlisle bought Isle Esme for a present for Esme
from Carlisle & Esme
Esme was born in 1895 making her 115, physically she is 3 years older the Carlisle, who is 23, making her psycically 26.
Carlisle was never married before he was 'changed'. Once he found Esme; they married early in their relationship (aprox. in 1921), at which Esme wore - according to Edward- a "very traditional ornate lace-and-orange-blossoms" wedding dress.
Isle Esme, off the coast of Brazil. Carlisle brought Esme an island for her bithday and she agreed to lend it to them for their honeymoon.