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Jenny was sexually abused by her dad.
Forrest shows up, and after having sex, she feels like she might have done the same thing to Forrest. In her mind, she sexually abused Forrest because he is not mentally capable of consenting. Do you see the parallel there?
That's the root of her internal conflict. She's terrified she's going to become her father and continue his cycle of abuse.
She eventually comes to realize that Forrest is more capable than she thought. However, she's a walking bomb of self-destruction at this point, and she knows it.
With the last ounce of selflessness she could muster, she leaves her child with Forrest. It was painful for her to lose the only two people who still love her, but any other action would ruin the child's life. At least, this is what she believes.
In the end, Jenny is a selfish and destructive person, but she abandoned love itself in order to save her child from her cycle of abuse.
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