I've always thought I had a past life connection with this person, so I thought I'd try using Lenormand to explore it. I'm using the French Cartomancy deck.
Why was C in my life?
woman - tower - fish - rider - letter
Woman + Tower = the woman was lonely, looked vulnerable
Tower + Fish = looking for opportunities, looking for a soul mate
Fish + Rider = potential opportunities present themselves, or something worth considering
Rider + Letter = a messenger, in and out, business carried out
Mirroring:
Woman + Letter = woman writes, a woman of letters, a knowledgeable woman
Tower + Rider = a lone rider
Fish by themselves and central = plenty of more fish in the sea, this to me seems to be renewing the searching partern
It's like you were vulnerable or appeared to be so, but availble and clearly looking for an opportunity. Given the karmic spread, I'm inclined of using soul with the fish card when I normally wouldn't, so I will say that you were looking out for a potential soul mate and stumbled into someone who was doing the pursuing more than you were. The energy of self-reliance from the tower and the hyper-action from the rider seem out of synch to me (tower + rider), what's the use of a rider in a tower? His place is out there on the field, while her's is safely tucked away, writing letters and doing all this forward planning. One of them was a planner, while the rider doesn't do much planning... He's given tasks and is pointed in the direction he needs to go in. All the planning is done for him. At any rate, it's as if you both agreed to leave it there and that the cycle begins anew, for if the man is alone, the woman is also.
The spread to me is trying to let you know that when you are lonely, and when an opportunity presents itself it is worth while pursuing it, if only to pass on to the next opportunity when the current one isn't what we truly need / or is out of synch.