Is it okay to tell your therapist you don't want to talk about something?

don't like talking about my suicide attempts, is it very rude or bad to tell your therapist flatly that you don't want to talk about it? I am seeing her for an unrelated matter but I don't want to lie and say I didn't attempt it.... nor do I want help with that aspect of my life so I'm just afraid she will perhaps terminate my treatment since I'm not playing along with her rules as it were