When did I become her?

I once had a mask, that I put on everyday. I used it so no one would be able to tell if I was sad. And until recently I was okay with being her, because I hated the real me. But then a met a guy and he taught me that no matter what I was still myself. He got me to open up and we even started to date. I thought he was perfect and he felt the same way. I was so happy the first couple days, but then something changed. I started to feel different and he became a faze. I told myself to be grateful because he actually cared. The only thing was I started to become her. The person I once dreamed to be. A person with no feelings and that didn't believe in love. A person who wouldn't be fooled by anyone because she wouldn't even give them a chance. Yes a person who was heartless and didn't give a damn. I became her, in a time that I didn't want to. I became her and now I wish I wouldn't have wanted to.