Hello @plo2011, welcome!
I hear, and understandably so, that you are concerned and scared 
As a starting point, and in no particular order, please enter suicide into the above search bar and previous posts from members will come up for you to read, and even respond to if you'd like. If you'd like to invite a member to respond, just use the @ symbol before their name.
Alternatively Sane has some really useful fact sheets on various issues surrounding mental illness which you might like to read here, particularly around suicide;
http://www.sane.org/information/factsheets-podcasts/434-sane-steps-how-to-help-when-someone-is-suici...
Lifeline 13 11 14 or even the Suicide Call Back Service 1300 659 467 would be a valuable resource to both you and your partner, they would speak to family and friends all the time with similar concerns to/as your own.
Who's about to support you @plo2011? A cuppa with a close friend, sister, or colleague that you could trust, just to air some of your concerns?
Let us know how you get on in the coming days, the community here is really supportive and I know they'll do what they can to support you, you're not alone.
Karma