I've noticed a bit my INFJ seems to get concerned about my feelings after we have a deeper conversation. Usually, the next day, he'll ask how I'm feeling. I, in turn, return the favor to see if that is his way of telling me how HE is feeling. I'm getting the feeling he does this to make sure we're still good and that I haven't changed my mind about him. I'm afraid he may feel a lack of security other than this that I don't know about and know he enjoys affirmation. What works best for you? What makes you feel secure in a relationship and what do you need to hear to feel good about where you are at with your SO.