I have never told a therapist about my suicidal thoughts. They're pretty mild as far as suicidal ideation goes; they're mostly thoughts about how I wish I could make myself magically stop existing. I know I would never actually do it--too chicken. But even though therapists aren't "supposed to" hospitalize patients for thoughts like these, I'll never say a word about them to a therapist because I know therapists don't always do what they're "supposed" to do. I had a therapist urge me to hospitalize myself for run of the mill panic attacks, and that scared the hell out of me because I thought she was going to force me into a psych ward over anxiety, so I'm just really careful about what I do and do not reveal now. Not worth risking having what little control I have over my life taken away from me.