Both phrases imply a level of support and reliability from another person, but there are subtle differences in their meanings:
A person who is there for you: This phrase suggests that the person is emotionally available and willing to provide support and comfort when you need it. They are likely to be empathetic, a good listener, and willing to lend a helping hand or a sympathetic ear during challenging times. It may encompass being supportive in both good and bad times and being present to share in your joys and sorrows.
A person who has your back: This phrase indicates a deeper level of support and loyalty. When someone has your back, they are not only there for you emotionally but also ready to defend and protect you if needed. They act as a steadfast ally and advocate, willing to stand up for you and support you in difficult situations. Having your back implies that the person is willing to go the extra mile to ensure your well-being and success.
In essence, "a person who is there for you" is supportive and caring, whereas "a person who has your back" adds an element of loyalty, protection, and a willingness to take action on your behalf when necessary. Both types of individuals are valuable in different ways and play essential roles in supporting and enriching your life.