What should I do in this situation & my relationship?

My girlfriend of 3 years and I were talking about things & she revealed to me something that made me turned cold. She admitted to me that at the very beginning of our relationship, she originally viewed me as a friend because she wasn’t attracted to me. She described it that she never dated someone of my type (being a bigger guy).

She pretended to be interested & went along with it so she doesn’t hurt my feelings with rejection. At a certain point, she told herself that people are born a specific way and it doesn’t devalue who they are as a person. Then gave me a fair chance & ended up falling for me. I didn’t know how to respond and just shut down. She kept telling me that she’s sorry and I just have no words to say. I feel completely hallow and disconnected. What exactly should I do?
What should I do in this situation & my relationship?
Post Opinion