ISTJs value their romantic relationships highly, and are looking for a long-term commitment. They want a partner whom they can find stability and security in—any partner who is unpredictable is not well-suited for an ISTJ. ISTJs will do whatever it takes to help their relationships succeed, and will put a tremendous amount of time and effort towards developing a deep, meaningful bond with their significant other.
ISTJs may have trouble being in-tune with their partner’s emotions. If their romantic partner is an “F” (feeling) personality type, this can be especially problematic. To overcome this, the F type partner must express their emotions directly with their ISTJ partner, rather than just holding them inside.