How Do I Protect My Marriage From an Affair?
You can affair-proof your marriage by fearing God, loving your spouse and setting boundaries.
You can affair-proof your marriage by fearing God, loving your spouse and setting boundaries. If you really fear God, you won't cheat. If you really love your spouse, you won't cheat. And if you're never in a compromised situation, it's a lot easier not to end up in an affair.
Nobody plans to have an affair. It usually starts small: a conversation that goes a little too deep, a text you don't mention, a coworker who "just gets you." If you're asking this question, you're already ahead. Let's talk about how to keep it that way.
What the Bible says
1. Fear God. If you really fear God, you won't cheat on your spouse. Fearing God isn't being scared He's going to smite you. It's honoring Him so much that you won't treat His commands lightly. When Potiphar's wife came after Joseph, his first thought wasn't "What if I get caught?" It was God: "How then can I do this great wickedness and sin against God?" (Genesis 39:9 ESV). "Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous" (Hebrews 13:4 ESV). And remember, Jesus said adultery starts in the heart long before it happens in a bedroom (Matthew 5:28).
2. Love your spouse. If you love your spouse, you won't cheat on them. So focus on a healthy, loving relationship that doesn't end up with the two of you feeling like roommates. Most couples don't fall out of love overnight. They drift: kids, schedules, phones, and one day you're just splitting chores and passing each other in the hallway. The best defense is a good offense: date nights, early bedtimes together, real conversations. Let your spouse be your standard of beauty. Don't let your mind drift to someone else, wishing and longing for something other than what you have. Don't compare your spouse to someone who hasn't built a life with you, raised kids with you or stood by you on your worst days. Proverbs says it to husbands, but it works both ways: "Let your fountain be blessed, and rejoice in the wife of your youth" (Proverbs 5:18 ESV).
3. Set boundaries. If you're not in a compromised situation with someone of the opposite sex, it's a lot easier not to end up in an affair. The easiest way not to sin is to not be in a situation to sin. "Flee from sexual immorality" (1 Corinthians 6:18 ESV). Joseph didn't stick around to argue. "He left his garment in her hand and fled" (Genesis 39:12 ESV). Here are some guardrails:
Never alone: not in cars, not at dinners alone, not behind closed doors without windows.
No personal, late-night text conversations.
Make sure conversations never cross the line into feelings for the other person.
If you've had a history with same-sex attraction, the same boundaries apply to anyone you could be attracted to.
Spousal accountability matters too: share your passwords with each other and keep your phone open to your spouse. I'll go first: my wife has all my passwords, and she checks my phone whenever she wants.
You might be thinking…
"Isn't that a little extreme? I trust myself." That's exactly what Proverbs warns about. "Pride goes before destruction" (Proverbs 16:18 ESV). Guardrails aren't there because you're weak. They're there because you love God and your spouse too much to risk it.
"What if I already have feelings for someone else?" Don't hide it. Cut off private contact immediately, tell a trusted friend or pastor, and consider telling your spouse with the help of a counselor. Feelings that stay in the dark grow. Feelings brought into the light lose their power.
Next step
Ask yourself which of the three is weakest right now: your fear of God, your love for your spouse, or your boundaries. Then sit down with your spouse this week, agree on your guardrails together, and put your next date night on the calendar.
Related questions
Genesis 39:7–12; Hebrews 13:4; Matthew 5:27–28; Proverbs 5:15–19; 1 Corinthians 6:18; Proverbs 16:18