http://www.dailymail.co.uk/femail/article-3846480/How-spot-partner-cheating.html
www.heartbreakers.com.au
Obviously this is only a short reference on things to look out for though ideally you intuition is the most important tool you have.
If you feel that you have a cheating partner though just require that piece of evidence to prove the facts, then heartbreakers are here for you.
Feel free to call us for a free consultation at any time.
Kind Regards
Luke Athens
1300 738 400