Why do people cheat in relationships?

Why do people cheat in relationships?

Paper instructions:
1. Use theory(conflict,symbolic interaction functionalism)to support research, and describe your methodology(how you got your research.

2. summarize research findings(primary and secondary).

3.In conclusion critically analyze the research findings. For example, interpret the future of issue/topic, compare the primary and secondary findings, and/or its relevance to the course.

Need 3 credible secondary sources. Each resource should be 6 pages long, and be from (PHD, Methodology recommendations, graphs, statistics. ect.)
Look for academic journals not newspapers or magazines.