ISTPs are generally extremely capable individuals who are good at most things which interest them. They are usually bright, interesting, and exciting individuals with a lot to offer. They live almost entirely in the present moment, and usually do not make commitments beyond the immediate foreseeable future. An ISTP probably coined the phrase "nothing is unconditional". They strongly prefer to take things one day at a time, rather than make long-term commitments. If a relationship interests them and satisfies their needs, the ISTP will do their part on a daily basis to keep the relationship strong and healthy.
ISTP Relationship Compatibility with Other Personality Types
ISTP Relationships: How to Hold an ISTP Tight (But Not Too Tight) | StyleCaster
To outsiders, INTJs may appear to project an aura of "definiteness", of self-confidence. This self-confidence, sometimes mistaken for simple arrogance by the less decisive, is actually of a very specific rather than a general nature; its source lies in the specialized knowledge systems that most people of this type start building at an early age. When it comes to their own areas of expertise -- and INTJs can have several -- they will be able to tell you almost immediately whether or not they can help you, and if so, how. INTJs know what they know, and perhaps still more importantly, they know what they don't know.
Tolerant, flexible and quick problem-solvers are how people of the ISTP personality type are mostly described. And this is indeed good news for those dating or in relationships with ISTPs. However they can also be overly concerned with details and sometimes even seem distant or too casual. TIP: Read this book which has questions you can ask your partner. Know your partner's secret desires and hidden fears with this book!
Everyone approaches dating and relationships a different way. You might be all about commitment, while that may be the last thing your bestie wants. Everyone is different, and of course that applies to dating, too — especially when you take your personality type into account.