Da frak "tricked by that dude by saying he will get a divorce".
Even if she is 24 and young and inexperienced or whatever bullshit excuse she wants to come up with for her plain retardness, by that time she had to read or watch dozens of stories in which the male never divorces the wife in a similar situation. That does not even happen in soap operas, for fucks sake.
She is dumb and young, period. But it's her life, and a possibility in life just passed by her. Last panel was so appropriate, loved it.