I'm in the same boat used to see one to two movies a month, now I've seen two in the last two years.
My main reasons are having to sit through 20 to 25 minutes of previews is brutal and the lack of quality movies. If you took out the superhero movies from The Last 5 Years I feel like there's very few other movies worth watching and I'm not even that big of a big superhero fan. We're getting to the point where movies are a redo of a redo of a redo...