I can see the "open to everyone" aspect, but I also think The Star can represent a totally open and healing love or friendship that is directed at someone specifically. A lot of times when it's a feelings or thoughts question, I read it as the person seeing someone as their savior almost---as their salvation. But they don't see the person for who they truly are; they see the love, the sharing, the healing, which is lovely, but it's not about each other.
Incidentally, I get it a lot in rebound situations, where couples really do have a shared respect and admiration for each other (not like a rebound where the rebound-er was angry or took the other for granted) but at the same time, it's not meant to be sustained.