"An E/INFP's love is hard to obtain. They may seem friendly and warm (or maybe even distanced, but friendly) in the beginning, but that is no different to how they treat everyone else.
The truth is, is that they quickly build a wall, in which you have to strategically, and slowly, knock down. The more you make this wall crumble, the more they will trust you, and the more they will open up.. But this takes time.
They will be slow to 'get personal', especially with details that they wouldn't necessarily share with anyone else. They will want to be close, but feel very unsure, wary of future hurt, or fallouts.
As time progresses, the more you share with them, and the more they feel safe with sharing with you, the closer they will become and feel.
Eventually their wall will be gone, and their wariness is eased. They'll be comfortable with you, they will feel confident in confiding in you. They will want to be close to you. They will want to care for you. They will feel warmth when they are with you.
Soon, they can love you, if they don't already do."