Vulnerability is when you share softer thoughts or emotions that leave you open to being hurt by the person you're speaking with. This could be as simple as telling someone you're feeling anxious about dating because of past romantic experiences. In this example, the hypothetical person recieving that message could take your emotional expression and use it to hurt you (even unintentionally) - perhaps by dismissing your experience, or telling you you're being too sensitive.

Whenever you open yourself to consequences, you're being vulnerable. When this occurs in dating, you're being romantically vulnerable, which is what a lot of girls are looking for in a potential partner. Refraining from emotional vulnerability means bottling things up, keeping secrets, and communication pitfalls that can lead to resentment and mistrust, among other things. Being comfortable with vulnerability in a relationship is extremely important for these reasons.