This statement is a heartfelt declaration of unwavering commitment and devotion. It expresses the speaker's intention to be with the person they're addressing forever and ever, standing as firm as a rock in their commitment.
It also conveys a strong desire for trust in the relationship, emphasizing that if the other person places their trust in the speaker, they won't be disappointed. The phrase "be mine as I am yours" underscores the idea of mutual commitment and reciprocity in love.
Overall, it's a sincere and reassuring message that conveys a profound sense of love, loyalty, and trust in the context of a romantic relationship.