Asking "are you cheating on me" assumes that they will tell the truth. If they ARE in fact cheating on you, they will likely lie too. If they are not, then you will likely only offend.
If you have to ask at all, there are other issues that need to be resolved first either with you or with them. I love Crucial Conversations, (Difficult Conversions, and Fierce Conversations are all good too.)
Amazon.com: Crucial Conversations: Tools for Talking When Stakes are High: Books: Kerry Patterson,Joseph Grenny,Ron McMillan,Al Switzler,Stephen R. Covey Amazon.com: Difficult Conversations: How to Discuss what Matters Most: Books: Douglas Stone,Bruce Patton,Sheila Heen,Roger Fisher Amazon.com: Fierce Conversations: Achieving Sucess at Work and in Life One Conversation at a Time: Books: Susan Scott
Stephen
www.♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥♥