Firstly, phone calls – any change in phone calls including frequency of calls, time of day, tone of voice or a change in text messaging habits could all signify that she is cheating. When she answers the phone, does she drop her volume or suddenly sound as flirtatious as she did when you were first dating?

If it seems like her phone habits are changing and you cannot understand the changes, you may be witnessing an affair, the Huffington Post reported.