If your boyfriend is not having a sexual encounter with you and he always says he needs to do something "urgent", it may be a sign that he wants to have an affair with a girl he just met and one who is way too mature for his taste. This is the reason why women are so fascinated by mature women. They know how to satisfy their men, and they know how to make their men have better sex. So if your boyfriend is always complaining about the amount of sex he is having or if he just wants to have more, it could be a big clue that he is cheating on you. Read the next lines if you want to find out how to tell if your boyfriend is trying to fool you or if he is really into you:.