True. I just remember thinking that the twist would've been better if it turned out she DIDN'T have Joely's heart...

Just like in He's Just Not That Into You, it would've been a better twist (and more interesting) for Jen to say "Actually Ben, I understand that you don't agree with marriage. The fact that you'd propose to me means the world. So much so that, no, I won't marry you, because I care about your opinions and thoughts and feelings as much as I do my own."