You put together two people who have not been put together before; and sometimes the world is changed, sometimes not. They may crash and burn, or they may set off a spark that will light the world.
People who learn to control inner experience will be able to determine the quality of their lives, which is as close as any of us can come to being happy.
The defining characteristic of pessimists is that they tend to believe bad events will last a long time, will undermine everything they do, and are their own fault.