Despite his strong advocacy for the aggressive drive and the will to power, that made Freud remark that he had “no place at all for love” in his theory, Adler does have some interesting passages on belonging and altruism ("the feeling of giving").
It is almost like Adler focusses on the ego drives (both active and passive) while Freud emphasized the object drives.
longing for belonging can easily be about longing for love in the romantic relationship
striving for perfection can easily be about being the sole possessor of the love object, as it is about possessing a good reputation in one's office, field, society, or history.
"Since true happiness is inseparable from the feeling of giving, it is clear that a social person is much closer to happiness than the isolated person striving for superiority. Individual Psychology has very clearly pointed out that everyone who is deeply unhappy, the neurotic and the desolate person stem from among those who were deprived in their younger years of being able to develop the feeling of community, the courage, the optimism, and the self-confidence that comes directly from the sense of belonging. This sense of belonging that cannot be denied anyone, against which there are no arguments, can only be won by being involved, by cooperating, and experiencing, and by being useful to others. Out of this emerges a lasting, genuine feeling of worthiness." (From "Individual Psychology," 1926).