<human>: I used the word "thing" because I am not sure if three weeks constitutes as a relationship even though sex was involved.

I met a girl online and we have been chatting for about a week to a week and a half before we met up in person. She invited me over to her place for the first time and I ended up staying the night. From the looks of it, things seemed to have taken off really well. However, by week three she decided to give me the "Let's be Friends" speech via text which included her informing me that she came to the realization that it wasn't working between us over the duration of a single weekend. She also included in her text that if I needed anything that she would be there. 

Miraculously, I have taken the news with a positive stride and walked away from this without falling into a pit of depression and sorrow. However, over the course of the week that I haven't contacted her I have come up with some questions that I need help with.

1) What is the true meaning to the phrase "Let's be Friends"? I have always been puzzled by this phrase. If she did not want anything to do with me, why did she bother including that phrase and basically tease me with any hopeful thoughts. Wouldn't it be more efficient to be direct and cut contact entirely? Is this just a method to make someone feel better about themselves?

2) Why would she also tell me if I needed anything that she is there for me? We are no longer in a relationship, we are nothing but acquaintances so why bother telling me that. She is not obliged to help me and frankly, I am not either.

3) I accept the fact that nothing will come about between us. However, I have lost contact with a lot of really great women in the past just because I was either too afraid or had a large sense of pride to continue seeing that person as "friends". Would it be pathetic on my behalf to continue seeing her even though something went on previously between us?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: What is the true meaning of the phrase "Let's be Friends"? Is it pathetic to continue seeing someone as friends after a short relationship.