Your thread could just as well be titled Addicted to happiness. When we are in love, real love, we are happy. That is a combination of chemistry and being loved and giving love in return. Who doesn't like that? If we accept 9 parts bad to get that 1 part to feel good, maybe thats an addiction to love that doesn't benefit us, but loving that specific feeling you mention I think is universal. All too often though the package deal isn't what we want.