What is the essence of excessive sincerity?

First, a lack of self-boundaries, treating giving as the only way to gain recognition and build relationships, and feeling uneasy when not giving;
Second, an internal belief imbalance, long-term placing others' needs above one's own, ignoring personal feelings, and even thinking that refusal is selfish and protecting oneself is wrong;
Third, misunderstanding sincerity as flattery, constantly yielding and compromising oneself in relationships to maintain superficial harmony;
Fourth, attaching a sense of value to others' feedback, the less response received, the more one gives, trying to prove oneself worthy of attention;
Fifth, ultimately forming a vicious cycle: the more one gives, the weaker the boundaries become, and the easier one is to be ignored or exploited, leading to increasingly unbalanced relationships.