A former Boston firefighter was sentenced Friday to two years of supervised probation for sexually assaulting a female colleague at a firehouse. A Boston judge also ordered David Sanchez to undergo counseling and, if deemed necessary by state officials, to register as a sex offender. Sanchez was convicted of assault and battery and indecent assault and battery following a two-day trial last week. Prosecutors said Sanchez tried to kiss his colleague Nathalie Fontanez and assaulted her in a Jamaica Plain firehouse before she was able to escape in January 2018. During Friday’s sentencing in West Roxbury Municipal Court, Fontanez said she’s dealt with depression the last two years and still relives the trauma of that night. She also said Boston residents “deserve better” from their first-responders.