Because though I did not state it as openly or directly as OrangeAppled did, I was implying similar things. It's disrespectful to behave in such a manner, where feelings that do exist are leaked because the girl can often pick up on the feelings (or they are leaked in an explosive manner such as described earlier in the thread), but yet he totally acts like a BFF and she gets completely confused. It's sort of a mindfuck, and makes women lose trust in men.
It's one thing to not know this information and do it, but I've told my INFP male guys that they're doing this, and they remain passive and the girl is hurt by it. This is not okay. One must realize that their actions (hanging out with the girl one on one a lot) are affecting her.
Note: Clearly this isn't applicable to every situation, nor every INFP male. To those whom this does not apply, please disregard. I just thought it important to point out that the passiveness can be hurtful to the girl. Either man up, or walk away from spending so much time with her that you twist her feelings around in unhealthy ways.