WHAT DO I DO IF MY FEELINGS CHANGED?

Okay so I was "talking" to my now-gf for a few weeks beginning in the middle of January. Up until we made it official I loved talking to her, loved seeing her on Skype (she lives two hours away), and REALLY loved seeing her on the weekends and spending as much time as possible w/ her. Well the weekend just before this past one (the weekend before Valentine's weekend) we decided to make it official and everything. Now I've begun to have feelings of apprehension and kind of have a longing to be single again... Truth be told I haven't been truly single for a year and a half. I went from a year and a half long relationship RIGHT into another one that lasted a few weeks and before THAT one was even over I was talking to my now gf. I know.....sh*tty way to go about things. PLEASE don't bash me for that I feel bad enough about it. Point being, I haven't been single for a while, I've always been wrapped around someones finger. Theeeeeennnnnnn we slept together after our Valentine's date... =/ Just afterward we were talking about it and other stuff and at some point she almost let slip "I love you." She stopped herself by changing it to "I love yo-......your body..." or something along those lines. I knew exactly what she was going to say though. A few weeks ago I told her I could see myself falling in love with her, but I didn't know she'd be dropping it on me THAT soon. And now that I look back...I really don't know if I could feel that strongly about her when it comes right down to it... :( I really f*cking hate myself for this though... I just want to know how I could maybe let her down a lil' easily, in light of recent events (i.e. sleeping together). I promise to God, Allah, Buddha, and any other diety you want me to swear to that I didn't use her as a booty call.