The fact that you're questioning this possibility is an indicator that you instinctively feel something in your relationship isn't right. Listen to that instinct, it's rarely wrong! However, something not being right, doesn't necessarily mean that he's cheating so before you start making wild accusations, try and piece some evidence together that won't make you sound like a possessive mad woman!

Think about why you have this feeling that something's not right. Is it because of anything specific? Can you put a date as to when it started? Is there a timeline you can consider and then think about other things that have happened in your lives since that period? For example, is he in line for a promotion, is he having a tough time at work - perhaps endless impossible deadlines, is there a problem with any of his family members? If you can't think of anything, then you have to give serious thought to the fact that whatever's going wrong is directly connected to your relationship.

Unfortunately, even if this isn't in your character, you need to do a little digging before confronting your partner. Go through his pockets and wallet looking for receipts that will place him somewhere he shouldn't be or buying something that's unusual and that you know nothing about. Keep a journal of his additional absences - such as the time he says he's working late. If he's supposed to be at the office, find a reason to phone him there on a landline telephone - not his cell phone! Find a reason to have to ring him from a phone that won't identify you as the caller on his cell phone.

Think about how his close friends are reacting towards you. Do you feel that they are uncomfortable around you? If he's having an affair, chances are that his closest buddies are aware of it. Try sounding out their girlfriends - girls need to stick together when a cheating guy is involved!

Ultimately the only way to find out if your guy is cheating on you is to confront him. Be prepared and pick your time - it should be a time when neither of you needs to be going somewhere else. Start off with a non-confrontational question, 'Do you think everything's ok with our relationship?' and take it from there. Use his answers as your navigation. You already know some of what's going on, he doesn't know this and so you control the process.

It could be that there's a perfectly reasonable explanation for the way he's been acting, so don't condemn him without hearing what he has to say. If his explanations don't add up however, you have a choice of letting it go at this time and seeing if almost getting caught makes him smarten up, or you can call an end to your relationship. The choice is yours, but make sure you are very certain that he is guilty of what you're accusing him of before you walk away from him.

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Some tips to help you tell if he is cheating on you.