Facebook Breakups

Everytime I have a fight with my girlfriend, she blocks me from calling the
house, shuts off her cell phone, and blocks me on Facebook, so that I can't
write to her, etc. She will make up with me after realizing that she
overreacts, and then wants me to re-add her on Facebook again. Is this
normal? We are in our mid thirties. I feel really bad. I have no idea why
someone would have an argument, but go to that great of a length to just
shut out the people that care about her. Personally if I have an argument
with you I will be upset and then get over it, but I am not going to find
every single person in the world that has ever upset me and add their phone
number into my call block registry.