[header] How to boost your girlfriend's self esteem [title] Be aware of her vulnerabilities. [step] We all have vulnerabilities in life. But those who have low to little self-esteem usually have a higher level of vulnerability and need extra support. 
As a partner to your girlfriend, much of that support will come from you in the form of empowerment, empathy, compassion, and love. Avoid the urge to judge her thoughts and actions and give her a strong sense of security, as you're the one she will mainly lean on.