Forrest Gump has the most terrible Oneitis for Jenny and in relation to her displays zero Alpha traits. As a consequence she walks all over him for the entire movie. She does return to him twice, but only when she needs to take a Beta pit stop. When she finally tells him she loves him, it’s as she lays dying of AIDS and it rings so hollow that even Forrest knows that it’s just one final manipulation.
Obviously Forest is not a smart man, but even very bright guys can get caught in the trap of being emotionally fixated on one woman to the exclusion of everything else. If you give one woman total control over yourself and endlessly play the nice guy card to her, she will only give herself to you on her whim and as her comfort needs dictate. Even if you’re married to her, you will be enshrined in her heart as “just a friend”.
The Beta stuff is always good, but the total lack of Alpha will allow her to crush your spirit until you can’t take it anymore, or there is nothing left to give.
Edit: Continue reading here… Oneitis? Twoitis? Onesideditis? And Jenny is a Heartless Bitch…
Also to be completely cynical, Forrest should paternity test Forrest Jr. (“I don’t know why she came back, but I didn’t care, we was like peas and carrots again”) You have to remember that by this point of the movie he’s a rich man, so Forrest Jr will get to inherit a fortune and she had no interest in being with Forest up until she’s dying and needs someone to raise her son. But then this is Hollywood, so it needs a happy ending for the main character… and the slut has to die.