You must hate it when someone lies to you. Yet, you can avoid being lied to. You can learn how to spot a liar. Try these simple things below, the next thing you know, you can tell every time someone does not tell the truth:

Never once did she even seem to consider the possibility that the problem could in some way be related to the fact that she had added about 40 unnecessary pounds onto a previously perfect body, had cut her hair ridiculously short, and fumbled around at home in frilly, flowery pajamas. 

When cheating you must create a line between “partner A” and “partner B”. This means never allowing the person you are messing around with to permeate your life completely. You should never allow this person into your home or even near your residence. If possible keep as much personal information, well, personal.