Because you are looking I’m assuming physical affirmation and a change in the way they behave and act as compared to others and before. You want them to say it to you. All the ways ENFJ’s look for love is where INTP’s are weakest. We show love through our actions and the fact that we wanna hang out with you. If you’re INTP can laugh and joke and have banter with you. Then that’s him showing affection. For us we aren’t one to say I love you or to hug you as often as others, but we do show it on other ways. We try to be useful and helpful and improve ourselves to be the best we can for you. We buy some flowers or do something thoughtful. We might remember something you’d thought we’d have definitely forgotten.
Now either you can say I need you to tell me you love me more and show it because I do not feel fulfilled. Or you can try to find these other languages that your INTP shows affection. Usually a healthy compromise works well. Getting us to say we love you isn’t hard if you mention it. Getting them to explain how they show their love might help