phina saurus rex mentioned in her post -- she is as well. Might be less common in INTJs, but I wouldn't call it rare.
The question you should ask yourself in my opinion is: what is his natural state of showing love or affection? What is your own state right now? Should I go for this guy? Should I try to disengage from this to look at it with a more critical eye?
Focus less on the MBTI, and more on the person you try to understand. MBTI can sometimes give you clues on how to handle situations, but to me MBTI is more about learning more about yourself (through introspection and questions), and to provide a platform to learn how to step into other people's shoes (through more introspection and questions).