Has shame over an intimate experience ever kept you from talking to someone you like or love?

I was talking to a friend about something I might call “sleeper’s remorse” and now I’d like to see what the fluther thinks is going on. What I mean by “sleeper’s remorse” is that you are with someone—a friend of the opposite sex—who you’ve been friends with for a long time, and then one night, for whatever reason, you sleep with them. Both of you are single, and free to do what you want.

I suppose it might also be similar to a situation where you have a one-night stand and one person becomes seriously interested in the other during the course of the night. That person then tries to reach out to continue the relationship afterwards.

But the other person (friend or one-night-stand partner) ignores the calls and texts and doesn’t get back to you. A friendship is in jeopardy. Why?

My guess is that it is some kind of shame that keeps the person from returning your calls. But is it? And whether it is or not, how does the thinking go inside the head of the person who doesn’t get back?