Fear of commitment and fear of giving in to others' wants and in the midst losing control.
I think some people start to ignore the other person because they feel some pain with each interaction. The interactions become aversive and after a while, they'd prefer to avoid any connection whatsoever.
I think I've been guilty of ignoring my sister's ex-husband. Even though they ended their relationship amicably, I avoid any eye contact with him when I see him in public, because if we do start talking, I'm afraid I'm going to start swearing at him for how poorly he treated my sister. So I guess one reason I ignore is because there is so much to say that cannot be said. It cannot be said because the other person wouldn't take it in anyway and that might increase resentment or because saying nothing is better than bringing to the surface old hurts.
Boy did I ramble on....sorry :)
I've wondered that too.
Here's how I feel. If I had any romantic feelings with someone just to find out they only wanted to be friends. I would say no. I'm not going to be friends with a mistake. I would speak up about that though. I can see someone simply choosing to ignore the situation if they want to avoid conflict.
Just because you were almost compatible as lovers, doesn't mean that you would be compatible as friends. It's an entirely different relationship. The lucky ones get to fall in love with their best friend.
The only logical explanation would be to treat it as a test.
Whatever floats thy boat.
Fear is the cause of this
I don't know feelings are simple but how we manage them is complicated... Maybe it was her influence