Should I end boring relationship?

Best friend is now gf, there's no spark, nothing left to discover and I'm bored. Should I end it? I'll keep this short as possible, I hate reading those soppy essays too. Me and a girl I live with at university, were great friends, nothing more, until one night we both got drunk and had . The next morning I woke up feeling uneasy about it, and spoke to her. It turned out that while I was kind of uncertain about my feelings towards her; she definitely liked me and thought that night was the start of a relationship. I told her, regrettably bluntly, that I didn't want to go in that direction. So she got upset, we had a really awkward day of barely talking, and she left town for the weekend. I was really confused about my feelings, and tried to explain them over the phone. She told me that I knew how she felt, so the ball was in my court. So I decided to take the risk and told her I wanted to be with her, after all, the friendship could hardly return to normal with me knowing she wanted more. That was 3 weeks ago. Since then we've been a fairly comfortable couple, but while she seems to delight in all the aspects of being a couple and thinking about our future, I've become increasingly restless. I barely feel attracted to her, sometimes I make excuses to not have , I look at her and never think that I feel any sort of romance, and yet all the time she adores me more. We still have the same laughs we had before, and I enjoy her as a friend, but that seems to be it. I also envy my single friends, and find myself imagining being with other girls. Thanks for reading this far. A few things worth noting; I live with this girl and other friends, so I spend a lot of time with her every day, I've been close friends with her for a while, so we know each other well, also its only been 3 weeks. I suppose my question is; should I end our relationship? When after only 3 weeks I'm already bored, of a relationship I never completely wanted, should I end it while it hurts less? Or