Your wife may be suffering from midlife crisis. Like many men at this point in the life cycle who have given most of their life to career goals, women may experience midlife crisis as a painful awakening of what has been missed by not spending time connecting to the intimate emotional life of the family. Midlife for women is also complicated by complex perimenopausal symptoms that can contribute to mood swings and irritability. Biological changes can exacerbate, but do not generally cause feelings of jealousy. The health of your marriage depends not only on nurturing one another, but on having friends, too.
Friendships enhance a good marriage.
Without outside interests and support, a marriage implodes from the pressure of unrealistic expectations that your partner fulfill all of your adult needs. Although your wife may enjoy adult interaction at the work place, your situation lends itself towards isolation. However it may also be necessary to build greater intimacy into your relationship with your wife at the same time you consider developing new friendships. Your marriage is experiencing some difficulty at this stage. Let her know that you want to spend time with her.