Part 2
Buss, Larsen, Westen, & Semmelroth (1992) studied the differences between the sexes as it related to feelings of jealousy and found that that neither sex was more jealous than the other. However, women get more distressed when they feel emotional infidelity and men get more upset with sexual infidelity.

References:
Buss, D. M., Larsen, R. J., Westen, D., & Semmelroth, J. (1992). Sex differences           in jealousy: Evolution, physiology, and psychology. Psychological Science,           3(4), 251–255.