3 Questions to Forming Healthy Relationships

Everyone has an agenda when interacting with another person.

I find these three questions particularly useful in deciding if a relationship is going to be healthy.
1) Is this person trustworthy?
2) Is this person useful to me?
3) Does this person threaten my self-esteem?

Being reticent, I don't send clear signal to people whom I interact with, thus there is a higher possibility that misunderstanding will arise. 

It feels great to be understood by someone. In fact, the crave for understanding is one of human's basic needs. However, being understood implies that one's vulnerability is left exposed for exploitation. The fear of being manipulated by evil minds is one of the concerns. Constant evaluation of one's agenda is therefore necessary to form healthy relationships.

Misunderstanding arises from the misinterpretation of the signals that are sent out by the other party. 
I think correct interpretation of these signals depends much on intuition and emotion less of logical reasoning because by elimination of possible interpretations, a wide array of possibilities remains. It is way more tiring to reason out one's agenda than to interpret it intuitively. While making assumptions about one's agenda, it is important to keep an open mind for other possibilities so that when assumptions made break down, it doesn't strike you hard to the extent that you lose balance in life.