I think it's more a matter of developing judgement over time about who is wise to invest in and how much. If you are hoping for reciprocation, there is a time for deciding that not enough is being given back and drawing back a little. When NFs are younger or more unsure of themselves, this can be a real problem. (Actually I think with Fs generally). Over time though, I think we learn to distribute our caring more judiciously or at least recognize when it is not likely to be reciprocated.
T types are more likely to change the situation if they are not happy with the way things are. F types tend to want to work out something that both people are happy with. They will bring it up when they are not happy, and that appears to T types like they are complaining. Either it's no big deal or you should change what you are doing. Either way it's up to you. It took me awhile to realize that this was their frame of mind and I often would make adjustments for them that were a bit of a sacrifice for me, hoping that they would notice and reciprocate. I didn't understand that in their eyes they did not understand I was making an adjustment because they wouldn't be as naturally inclined to solve problems in that manner.
Some unhealthy F types can be emotional vampires and it is important to decide whether someone is worthy of you sinking a lot of time and emotional energy into them if they are unlikely to improve their circumstances, listen to advice, or be dependable friends in return. It doesn't mean you have to shun those people, but at least then you do not become a victim. You decide then how much you wish to invest and for what kind of return.
In general, whether you are dealing with insecure Fs or Ts, they will have their own interests in mind first and foremost, even if they are good people. Insecurity puts the focus on yourself and your own needs because of the belief that if you don't look out for yourself, no one else will. It also is hard to get outside of yourself to look at other people and their needs. If you understand that it is nothing personal, but just that they have bigger things prioritizing their energies, then you don't feel nearly as hurt or blindsided. You may want to consider though if they are going to affect you negatively enough that you may not want to have them as your closest friends, because they will let you down.