Michelle Carter was convicted in June by a judge who said her final instruction to Conrad Roy III caused his death.
Carter was 17 when the 18-year-old Roy was found dead of carbon monoxide poisoning in July 2014.
Juvenile Court judge Lawrence Moniz on Thursday gave Carter a two-and-a-half-year jail sentence but said she had to serve only 15 months of that. He also sentenced her to five years of probation.
Carter's lawyer, Joseph Cataldo, asked the judge to spare his client any jail time and instead give her five years of probation and require her to receive mental health counselling.
Anyone who may be feeling distressed can contact the following organisations for support.
SANE Helpline 1800 18 72 63
Lifeline 131 114
Beyond blue 1300 22 4636
