ISTJ personalities are dedicated and loyal partners, devoting an enormous amount of effort to ensure stability and mutual satisfaction in a relationship. They also tend to be very responsible and relatively conservative while dating. Once an ISTJ commits to a relationship, they will stick to their promise until the very end. People with this personality type gladly accept their duty to play a specific role in the relationship.
ISTJs approach relationships from their usual rational and traditional perspective. Dating an ISTJ may not be easy as they are likely to need some encouragement and patience—ISTJs are Introverted (I), after all—but that shell often hides a strong and quiet determination and reliability that is rarely seen among other personality types.
ISTJ personalities are hard workers, and this covers their relationships as well. They will do their best to fulfill their duties and keep the relationship functional and stable. ISTJs can easily take care of daily tasks, and they can also be surprisingly good at providing emotional support as soon as they realize that their partner needs this.
That being said, ISTJs tend to believe that their approach is always right, especially when they are faced with criticism. ISTJs should remember that “winning” the debate might often cause them to lose much more outside it, especially when it comes to a romantic relationship—and even more so when that relationship is still in the dating phase.
In general, ISTJs are not very good at sensing their partner’s feelings and emotions. This may cause some issues if their partner has a Feeling trait (F) as these personalities tend to expect a lot of emotional support, which does not come naturally to ISTJs. Every ISTJ who is in a romantic relationship, no matter if it is beyond the dating phase or not, should pay particular attention to this matter. ISTJ personalities are also likely to stick to traditional gender roles, feeling uncomfortable with anything out of the norm.