Yekke2 – on the other hand, if your “beshert” is not someone who will make you happy, you can daven to have your mazel changed as Leah Imeinu did, or you can get divorced as many have done.
I think that for the most part, we all can be happy in theory as long as we daven and do what we are supposed to do. “Ivdu es Hashem b’simcha.” If we are told to be happy, it must be possible.