Could she be that naive?

Hard to believe that Suzy could be so naive as not to see right through Rick's marriage proposal. Either that or she's shallow which I doubt. So the only other alternative was that she was playing with Harrison's (Harry's) emotions in some sort of contrived attempt at revenge for him leaving town years earlier. In any case, considering any one of those three reasons are true and when she allegedly changed her mind about going to Dallas with Rick at the last moment, Harrison should have kept her where she had him. She put him in the friend zone so he should have insisted they just be friends and moved on. No one deserved a girl like that except maybe Rick.