Losing Motivation

Does anyone else ever lose the motivation to keep running? Sitting at my friend's house on Sunday afternoon, I just couldn't get out the door to run. I began questioning why I even run in the first place, and pushed all of the things I love about it out of my mind. I have never really enjoyed the actually act of running- I like the feeling of accomplishment afterward, and I like seeing my improvements. I also love the camaraderie of our team and following professional running. I was actually pretty close to quitting (or at least taking a long break). I didn't end up going out for a decent run that day, nor the next. I was pretty down on myself and on continuing running competitively. The constant worry and commitment can get very tiresome. I guess I needed that two day mental break, because yesterday and today I was ready to go again. The break revitalized my mind and my body. Anyone have any other similar thoughts or situations to share?