Remember. It is always important for both sides to discuss having a child. Otherwise it is kinda rapey and bound to cause anger and relationship decay down the road.
Nah fam. This was not cute. That was really dumb and really wrong of her. It's one thing if it was an accident but she intentionally manipulated him into helping het get pregnant without him knowing. That's like your girlfriend suddenly stoping birth control while telling you she's still on it. The mom is selfish and just betrayed him for probably no reason other than "I really wanted a child with you".
I'm 100% sure all the problems her betrayal is gonna cause are gonna be negated because she dies and his feelings over what she did to him and how wrong it was for her to do that
aren't ever going to be addressed.