Jen,
When I was married, I did that, particularly around the 7 year period. Though I never loved my husband, I stayed in the marriage for 20 years until our daughter left for college. So this probably doesn't help you much, since you do love your husband. I was never unfaithful to my husband, by the way, during the whole marriage. But I do remember around the 7 year mark I was obsessed with someone.! Maybe that's what they mean by the "7 year itch!"
Sorry, I know this isn't much help!
Seeker