Sweetie, I hear you. I can't "click" with ex JWs who just go, "ah well, it was all a lie. Life goes on." My head can't compute - or maybe, as @days of future passed suggested, I'm really jealous of the lack of damage wreaked on their lives.
HOWEVER - that's what places like this forum are for. Vent it out! Bare your frustrations! We hear you, @Addison0998. Please don't consider death as a better option for the life you have at the moment. You'll make the world short one ex JW, and we need you. You are an asset to humanity just based on the awakening and courage you've displayed over the last several months.
As for your partner being a bit nonchalant about things - perhaps this is a good thing! If the two of you were so deeply embroiled in the feelings of grief, loss and anger, etc, it might consume your relationship. One thing people recommend when exiting a cult is to get friends in the "real world" (aka, those untarnished by the cult). Your fiancé could be your ticket to light-hearted normalcy once all the rage and disbelief dissipates. Try and think long rather than in the immediate future :).
I really hope this helps you, hon. Xxx