1) Password protect your phone.
1B) Install a program that will take a picture and e-mail you, if 2 or more password attempts are incorrect. Caught 2 girlfriends (now ex-girlfriends) with such programs.
2) Consider turning off location and GPS whenever you go out. To turn everything off, you might need to jailbreak or get admin. rights. Many iPhone users have been tracked by suspicious girlfriends/boyfriends and wives/husbands in this way.
2B) Have a second SIM card. If your phone is unlocked, you might can get one from econnect (
http://www.econnectjapan.com/) And you can buy 2 SIM capable phones on the Internet.
3) Password protect LINE, if you are using it and are married or living with someone. So if they hack your phone, they still can't get evidence.
4) Create e-mail accounts that your spouse or live-in boyfriend/girlfriend doesn't know about.
4B) Do NOT use SMS. Tell your lover that you hate SMS. Remember to delete any SMS after being read.
4C) password protect e-mail programs on your phone. If they hack the phone, they still can't get anything.
5) Password protect or hide contact info. of secret lovers.
6) Create some personal space to do activities on your own.
Get a hobby like playing billards, darts, bowling, kick-boxing, golf bars, etc... Preferably something you like, but your girlfriend/wife doesn't like so much and will leave you alone. When you go to pursue your hobby, hopefully no questions asked.
7) Try to create a "don't ask, don't tell" relationship.
That is, if you go out, just say when you will return home. And gradually push it, so that coming back in the morning is fine.
Absolutely refuse to give in to interrogations and 100 questions about every place and thing you do.
To create some space, some guys or women will not be cheating right away. They will FIRST battle for the TIME and personal space that will ALLOW them to cheat. Women are especially good at this tactic, because they can often get their secret male lovers to committ to exact meeting times for sex.
If the spouse tries to check up on you, there will be NOTHING for them to find and you can admonish them for violating your privacy and trust. After getting the right amount of "don't ask, don't tell", then CHEAT.
8) Admittedly, this one is a curve ball, but introduce the idea of becoming a SWINGER.
It's often hard, because you didn't start your relationship out that way and many women can be close-minded.
However, it might be worth it, as open-sexuality has surprisingly helped some couples. And surprisingly, some wives can be up for it, if they feel the husband approves and they will do it together.
If it doesn't work, there is always the route of cheating and secret lovers.
9) Don't get lazy and be always vigilant about protecting your privacy and secret lovers. Many husbands and wives get caught by being plain stupid or relaxed their guard too much.