Disillusionment

I've noticed that there is disillusionment the synastry chart in most, if not all, relationships I've been in.

Can someone please explain what it means to me, and how can I cope up with it?

Do you mean you feel disillusioned because your relationship didn't turn out like how synastry chart promised?

Honestly, I'm not sure myself. It's only recent that I've learned about the synastry chart. And the disillusionment is always present in it. Lol

And I'm not too sure if I'm the one who feels disillusioned or the other party is.

I think I tend to accept them as they are, but I'm not sure if subconsciously that isn't really the case. Or do they then feel disillusioned by me because I don't seem to be the person that they think I am when they've first gotten to know me?