Long-term romantic relationships are some of the most meaningful ones we can cultivate. But make no mistake: They require a lot of work. From ensuring your partner feels loved and understood to splitting the housework and parenting responsibilities in a way the two of you see fit, communication is key. If you neglect these things—and, sometimes, even if you don't—infidelity could come into the mix. And that, of course, can spell disaster. Read on to discover the real reason why women cheat—and learn how to keep your connection healthy and strong in the process.