Finding the one to share a relationship with is a blessing. Once you've bonded with this special someone, keep in mind that respecting your partner's privacy and retaining trust are essential to maintaining a healthy relationship. If you cross certain behavioral boundaries that violate your partner's trust, you may cause irreparable damage to your relationship.
1. Prying into private info. If you suspect your partner of betrayal, does that give you the right to start reading your partner's email? To listen to his/her voicemail messages? To hack into his/her online profile? The answer to all of these is "no!" You should never dig through your partner's personal emails or listen to your partner's voicemail messages. You should never dig through your partner's personal emails or listen to your partner's voicemail messages. By doing this, you violate not only your partner's trust, but also the trust your partner has with anyone who left those voice messages and emails.
3. Pulling a "James Bond." You should never snoop in your partner's private things (drawers, wallet, filing cabinet, or private records -- such as bank or credit card statements). Furthermore, nothing justifies snooping. No matter what you have a "hunch" about, snooping through your partner's things should never be pursued to confirm or deny your hunch. Your partner's possessions and personal records should be kept private unless he/she gives you permission to look at them. Spying on your partner is one of the most blatant violations of your partner's trust and will achieve nothing except having your partner never trust you to be alone near his/her things ever again.
5. Sending others to do your dirty work. Don't ever send a friend or anyone else to gather information for you about your partner or to spy on your partner for you. This means, don't send a friend to go hang out where you know or suspect your partner will be. Don't have your friend try to eavesdrop on your partner's conversations in places he/she goes. Don't ask your friends to use their cell phone to snap covert pictures of your partner. All of these favors from friends not only violate your partner's trust, but also reveal your total lack of trust in your partner.
So even if you have some type of "intuition" that your partner is hiding something from you, it's better to engage in a confrontation with him/her openly rather than searching for answers secretly. Even if your partner doesn't respond to your attempts to talk about it the first, second, or third time, chances are that you'll eventually discuss it -- and the outcome of voicing your suspicions honestly with your partner will always be better than if your partner discovers you engaged in any of the behaviors I've talked about.