Changes in behaviour
Changes in behaviour are the most important indicators when it comes to finding out whether your mate is cheating. You should consider the ways your partner used to treat you at the start of your relationship and how he or she does now. If your partner gets irritated at you for no reason and feels bothered every now and then, there could be something you don't know, especially if you were never treated this way by your mate in past.
Stops returning your phone calls
If your spouse or partner stops returning your phone calls, it is another important sign that he or she is tired of this relationship. When the relationship between two people is at its peak, partners usually stay in touch with each other on regular basis.
Regularly works late
At times a person has to work for a longer period of time as compared to the normal routine; however, if it becomes the norm, you need to investigate whether your spouse or mate is really working. Unfortunately, this is the most common excuse used by a person avoiding his or her partner and hiding something.
When a couple is loyal to each other and the relationship is going smooth, they always manage to take time out of their routines for each other. However, if your partner is mostly tired and avoids spending time with you, it could be a sign that he/she is losing or has lost interest in you.
Leaving home in the middle of the night
If your partner receives a phone call in the middle of the night and leaves home soon afterwards, chances are high that he or she is cheating on you.