ISTJs and their relationships

The ISTJ's word is as good as gold, and they honor their commitments faithfully. They believe that to do otherwise would be nothing less than a breach of honor and trustworthiness. Consequently, they take their vows very seriously, and once they have said "I do", that means they are bound to the relationship until "death do us apart" or otherwise. ISTJs are driven to fulfill their responsibilities and duties, and will do so with tireless effort. They will do their best to meet the obligations presented by the different relationship roles which they play during their lives, i.e. spouse, parent, offspring, etc. They may have difficulty showing warmth, but they frequently feel it in abundance, and most develop the ability to show it through sheer effort. If nothing else, the ISTJ holds the gold medal of all the personality types for Effort. They will put forth tremendous amounts of effort to accomplish goals which are important to them. If healthy relationships are among these goals, you can bet that the ISTJ will do everything that they can to foster and maintain healthy relationships.

Source: http://www.personalitypage.com/ISTJ_rel.html