Assuming "her" to be the girl whom you're dating.

Being spontaneous can make her know a lot about you, Making her know about me is going to make her familiar with me. Now, Tomassi says "Familiarity is anti-seductive".

Can anyone help me understand this, please? Thanks!

My understanding is that "Familiarity is about telling a girl sth personal about yourself like your struggles and your family life and stuff". Do correct me if I am wrong, Thank you!