You feel committed to your guy, but are not sure he feels the same. Even if you have asked him if he is seeing other people and he denies it, you can employ other methods to learn if he's telling the truth. In addition to trusting your instincts, observing his behaviors, listening to his words and even talking to his friends can give you a clue whether he is seeing other girls. Overly suspicious behavior, however, can harm a relationship. To continue in your relationship, you and he must work toward honesty in words and actions.

Notice if he is being protective or secretive with his phone calls or messages. An unwillingness to share who is calling, or quickly hanging up or silencing his phone, are clues that he may be seeing other girls, psychologist Diana Kirschner says, writing for Psychology Today. You might find other cheating clues by looking at some of his correspondences, such as bills, emails and instant message chats.

Listen to what he says about your relationship. If he mentions feeling unappreciated he may be inclined to cheat, says M. Gary Neuman, a marriage counselor and author, writing for Oprah.com. Men need to feel valued in a relationship in order to feel secure. If your guy shares that he is unsure where your relationship stands or even if you care for him, these could be signs he is or is thinking about dating other girls.

Check to see if he talks about other women. Some men are unable to hide their admiration or interest in another woman, because they are excited about the potential of that relationship. Notice if he especially talks about someone in a different social circle that you share, or about a new person at work. These can be signs he is dating other girls.

Ask one of his friends. Notice if the friend shifts his eyes, becomes fidgety or has pauses in the conversation as he may not be telling the truth, says author Elisabeth Eaves in a Forbes.com article titled "10 Ways to Tell if Someone is Lying to You." These cues could be signs he is uncomfortable, because he knows your significant other is seeing other girls.

Look for clues in his answers. Ask him a simple question like "What did you do last night?" and see if he gives short answers or detailed ones. Details may suggest that he is telling the truth, notes Eaves. However; ask him to repeat his story and if the details change in any way, he may not be telling the truth.