Here's my situation:

I was non-greek for the first year at my school. The next fall I rushed and joined a group. I simultaneously fell madly in love with an athlete. (This was mid-September). We started seriously dating and all was bliss! At the end of October we finally got our big sisters. I loved "Amy" and she loved me! Well about a week later she asked who I was seeing and I told her he was an athlete - no one she'd know since he wasn't greek. She asked again so I told her and she said that she knew "Jack" also and had dated him. I just laughed it off thinking it was no big deal. When I asked "Jack" he said yeah they weren't any big thing - they had met one summer at the beach and that was about it.

Wellll....a month or so passed and Jack and I got really serious about each other (*blush*)
so I told "Amy". Well Amy knew all about that road...much to my EMBARRASMENT! It turns out, not only were they a big thing once before, but also had a short lived affair later on. Plus - it turns out - he (being a year older than she) was the reason she had come to that school!

I say all this to say: I felt really weirded out when I found all this out and I didn't even know EITHER of them at the time. So how weird would it have been for me to have known her and had a relationship! Gross!