In [*Forrest Gump (1994)*](http://www.imdb.com/title/tt0109830/), Jenny seems to be walking away from Forrest's life plenty of times. However, even though the other ones are coherent, the last one isn't meaningful at all.

The first time she walks away from Forrest is at the bridge right after the singing scene of Jenny. By asking Forrest if he thinks she can fly from that bridge, she makes it obvious that her mental state is not stable and she also seems to know about it and therefore she tells Forrest to *stay away from her.* She hitchhikes and leaves.

The second time is in Washington, but she was already a part of another group by that time and had people in her life. So it is not that shocking that she decides to not come back to Alabama with Forrest.

The third and final time is when she came back as Forrest was cutting grass. Now she obviously came back—as stated in the movie—because *she had nowhere else to go*. And as far as we can see, she is happy. Why did she leave? Especially right after sleeping with Forrest.