If your mental health provider such as your doctor or therapist believes their(you) patient is in imminent danger to yourself or another person, then they are obligated to intervene and break confidentiality to advert suicide or homocide (crisis intervention via hospitalization is an example).

However, telling them you have had thoughts of suicide lately but have no actual suicide plan, for example, wouldn't be considered imminent and therefore confidentiality remains intact. I'm in the USA and that is how it works for the state I live in. Take care.