The level of resonance can be at the heart and brow centers, and sometimes even the crown center. When the heart chakra opens, and there is significant compassion this can also be a cue to the depth of the potential of this relationship. This is not the kind of compassion that occurs for others circumstances, like when we feel empathy.
In any kind of relationship, even when you are aware there is a unique opportunity presenting itself with a particular person there is always a choice for both people. So just because you feel a specialness it does not mean the other person recognizes the expereince the same way you do. Whether there is a recognition of the relationship potential or not by the other person, It is likely you will remember this meeting for the rest of your life.
So far what I am referring to have been positive resonant meetings. It is also important to note any negative response and to honor this knowing, as well. I am also not describing what happens in a sexual relationship exchange which is entirely different.