Event - I guess this really doesn't matter, because I did love her. But when I was 17 my girlfriend wanted to have sex. She was a virgin and I had told her that I was too, but I was not. I just thought at the time that if she thought I was a virgin too, she would be more at ease. I didn't feel I had to trick her, but it just seemed like it would make her feel better.
Apology - I should not have lied about something so important. I don't think it changed anything about our relationship, but she thought we were sharing our first time together and we weren't. I apologize to her now.