SL Letter of the Day: The Next Level

Originally posted on July 25, 2012.
I am a 25-year-old straight woman. I recently started seeing a man. The first time I slept with him, he told me that he was interested in a relationship, and I told him that I wanted to keep things purely casual. Over the next month and a half of talking to him, hanging out, and having sex, I started to really like him. I was thinking about changing my mind and taking the relationship to the next level.
The last time I saw him was a week ago.