If I had gotten laid as often in college as I heard the words "I'd rather just think of you as a friend", I'd have been a much happier guy, though arguably, the two don't easily co-exist. Those were the unfortunate days well before the current FWB phenomenon.
It only took 30-35 years, no, not to get laid, but to agree with them. There are a number of ex-love interests from my college and even high school days that I had been out of touch with for many, many years with whom, thanks primarily to facebook, I am now friends and I like that a lot. I do find myself caring about them, and wanting to know how they are doing, and what they are up to and how their lives turned out, but have no interest in what I may, in college, have been most interested in. I doubt I need to explain that thought any further.