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don't do it. It's true, you'll never be totally "prepared" to be a parent, don't wait for that moment. But if you're highly ambivalent about whether you want it at all, why do it? It's not a job for the ambivalent. And I wish more ambivalent people would stop breeding just because it's expected of them.
That said, I'm a little suspicious of the fiance, Piper. She says the door's still open, and if he wants to she'll probably "go ahead and do it". It sounds like she doesn't want to face this issue and is pushing the deicsion off on him, frankly. Or else she doesn't want to be the one to say she's changed her mind and wants to be a parent (maybe she's been saying otherwise for so long she's worried about her "coolest girlfriend" status changing). I don't really think it's fair of her to put him in that position. They should both have many very extensive conversations about it and not leave it up to one of them to convince the other. And if one of them is only 30% on board, that's not good enough!
Can't wait to see tomorrow's update...