I'm looking at buying this 2013 Honda Accord with 100k miles on it, but my main concern is about the CVT transmission in this car I have had a lot of stories about them not being reliable or there is nothing I need to worry about.
Have you checked previous posts about honda cvts?
https://carkiller.com/scottykilmer/?wpfs=Honda+CVT
Honda is actually better at making CVTs then they are at making traditional automatic transmissions.
Those are good cars and the CVTs can last a while if maintained. Make sure to have a mechanic check it out. I remember a number like 200k mile life for Honda CVTs (from Scotty) but not sure how accurate that is. But it sounds about right. Toyota & Honda are the best makers of CVT transmissions. Nothing like those Nissan or Subaru transmissions which go out around 100.000 miles.