Falling out of love with your job is very normal, specially if you have been in the same job for a few years. But it doesn't always mean that you should look for another job. 

Here are a few tips on how to fall in love with your job again: http://www.bnet.com/blog/entry-level/lost-your-passion-for-work-3-ways-to-love-your-job-again/4218?tag=drawer-container%3Bload-section-river