That's happened to me before, you just fall out of love with riding and you cannot explain or force yourself to go.It was. I am not sure what happened but somewhere around August I just lost the will to ride. I wasn't particularly busy doing other things but I just lost the love of riding. The fact that I have a rather sexy Carbon roadie didn't seem to help at all. Now, the weather is muddy and a bit mizzy, I am loving it again. I've now sold my MTB, my Defy is for sale and I have 5/8ths of what I need for my CX/Adventure bike or whatever they are calling them this week.
The world seems to be looking up a bit at the moment, which is rather unusual at this time of year for me. Even better, my hands have warmed up enough to get 10 minutes practice in. I didn't think that they would warm up in time.
Like you I got back into it as strangely as i left it, just woke up one day and wanted to go riding and it stayed with me until my accident which was worse because that wasn't my decision and I was just going round the twist because I couldn't physically ride.
Glad to hear yoom back in to it