It seems like your boyfriend believes that you possess qualities and attributes that would make you a great partner for anyone. Without knowing you personally, I can't provide specific reasons, but here are some common traits that might make someone lucky to have you:
Kindness and Empathy: If you are compassionate and understanding towards others, people appreciate having someone who cares for their well-being.
Intelligence: Being smart and knowledgeable can be attractive as it fosters interesting conversations and problem-solving abilities.
Sense of Humor: A good sense of humor can lighten up any situation and create a positive atmosphere around you.
Loyalty and Trustworthiness: Being a reliable and loyal partner builds a strong foundation for any relationship.
Supportive Nature: People value partners who are supportive of their goals and dreams.
Communication Skills: Effective communication is essential in any relationship, as it helps to understand each other better.
Independence: Having your own passions and interests can make you an interesting and well-rounded individual.
Positive Outlook: If you have an optimistic attitude towards life, it can be infectious and uplifting for others.
Respectful and Understanding: Treating others with respect and being understanding of their perspectives is crucial in maintaining healthy relationships.
Caring and Affectionate: Being affectionate and showing you care for your partner is something many people desire in a relationship.
Remember, everyone is unique, and these are just general qualities that can make someone attractive as a partner. Your boyfriend likely sees a combination of traits in you that he finds genuinely special and admirable, making him express such a statement. Ultimately, what matters most is that you are true to yourself and find someone who appreciates and respects you for who you are.