ah well, that's easy...just send him some chocolates with the ex lax inside....
Seriously though I was thinking about what you said in regards to his guilt. You might have something there...if he's still feeling guilty and a lot of regret, he might not necessarily be thinking about you & a "possible 2nd mistake" but more along the lines of "am I ever going to get away from this?" kwim? Like when he sees what a great mom you are and accept the child as your own, he'll be constantly reminded just how much he messed up... Not saying it's rational or fair to put on you...just wondering if that might be something he's feeling.