People like to say love is unconditional, but it's not, and even if it was unconditional, it's still never free. There's always an expectation attached. They always want something in return. Like they want you to be happy or whatever and that makes you automatically responsible for their happiness because they won't be happy unless you are ... I just don't want that responsibility.
Actual happiness always looks pretty squalid in comparison with the overcompensations for misery. And, of course, stability isn't nearly so spectacular as instability. And being contented has none of the glamour of a good fight against misfortune, none of the picturesqueness of a struggle with temptation, or a fatal overthrow by passion or doubt. Happiness is never grand.