The best replacement for infidelity is cheating.

The best alternatives to infidelity are rated as following:
★★★★★  cheating
★★★★  adultery
★  affair
★  physical infidelity
★  fidelity
★  bedlam
  female infidelity

Your alternative for infidelity is not listed? Suggest!
Speaking about infidelity, one probably shouldn't forget about guilt.

Other search terms related to infidelity and their ratings are:
★★★★★ guilt
★★★ remorse
You have in mind a companion for infidelity and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of infidelity in all years. Click on graph for more.
infidelity
cheating
adultery