Poodles, I had seriously bad, full blown depression over 5yrs before I had DS. There was mention of PND, we all run the risk of it, regardless of our history. I didn't get it, and neither did you.
DS dad was horrific, didn't do a thing, told em to take the baby out of the room so his sleep was not disturbed.... and he wasn't actually working out of the home, he was developing/renting property, so not a 9-5 at all. No excuse. He did however sit with DS of an evening, hold him and cuddle him.
He never once called him a name. Mind you, he wasn't the one up for 4 days straight....
You say that your P didn't just love you, it grew over time. Sorry honey, but I think he got used to you and accustomed to having you around to care for him.
This is not a match made in heaven. He is not going to suddenly get all loved up over his DS.
Is that what you are prepared to settle for? a life of someone being with you out of habit, circumstance?
Your DS is 5wks? wait till he gets possessive over you.... will your P take the competition?
Seriously, being on your own is better than sharing a space with a man that is calling his only child names within the first month.