Is he cheating? Is she having an affair? Is the uncertainty eating you alive? More than relying on a feeling or a hunch, check out the below signs of potential infidelity. Does your spouse or significant other:

• Avoid answering the phone when you're around?
• Regularly go to work early or come home late?
• Display a lack of affection?
• Refer to a new "friend" at work?
• Have unexplained credit card charges?
• Say it's "in your imagination"?
• Act more picky or angry during normal conversations?
• Spend less time with you and the children?
• Have scents of cologne or perfume on their clothes?

If five or more of the above signs apply to your spouse or significant other's conduct, consider seeking marriage counseling. It's common for couples to hit rough times, and a qualified therapist can help couples identify and resolve their differences, as well help them to communicate more effectively.

Another option is to hire a private investigator (PI) to obtain evidence that infidelity is taking place. If you choose this approach, it's important to hire a PI who's qualified in infidelity investigations, has experience conducting such cases, and is ethical, discreet, and professional. Below are a few tips for finding a qualified PI:

• Check your state's private investigator associations, most of which have web sites that post their membership directory.
• Ask friends, business associates, your lawyer for a referral. Word of mouth gives you the inside scoop, and the opportunity to ask questions specific to your needs.
• Check Internet and Yellow Pages for private investigator listings, but remember these are paid-for ads. Ask for references. If you're going before a judge and jury, ask if the PI has courtroom experience. NOTE: An untrained investigator may not know the laws and end up doing something illegal during an investigation-which will cause you problems.

After you select a PI, interview him/her. Gauge your comfort level, ensure you have good communication, and agree on a retainer. After all, this person will be working closely with you as he/she gathers evidence that you will use to make a life-changing decision.