I need to vent
My fiance has been unhappy at his job for awhile now, mostly due to his own stress & anxiety relating to what his role is/will be at his company. He was initially hired into an entry-level position, but for the past 6 months has moved on to do various other projects within the department. He applied for a promotion last week and didn't get it. Now he's devastated because his other projects are done, and has to go back to doing the entry-level position (which is what he's feared for 6 months). He sees this as super embarrassing (since everyone else he started with has moved up to other roles), and wants to just quit because of how depressed he is. I feel like it's just the anxiety/depression talking, and that he would feel worse after the initial 'high' of quitting his job without having anything else lined up.
The other aspect of all of this is that for the past month, we spend most of our time together talking about his anxieties and worries involving the situation. It's all he thinks about, talks about, he doesn't sleep well, and he often can't eat. It's incredibly draining on our relationship, and I feel like his anxieties are seeping into me. I've encouraged him to see a therapist, psychiatrist, etc. and he doesn't think it will help, but he did finally agree to try.
I want to be supportive of him doing what he needs to do, but I think he may regret quitting his job when the smoke clears. I fear the negativity/anxiety he feels about this job will just transfer over to the unemployed job search. It also seems like we shouldn't spend money on a wedding and honeymoon when he's unemployed, but we've already put down deposits and sent save-the-dates. He wants to spend his life savings living jobless for as long as he can.
I just don't know how to motivate him anymore.