I don't know but I can just see Sean winding Max up about Tanya and then Max turning round and hitting him with the abortion thing in retaliation. Something like Sean going "You really think you know your wife- she wants me!" and then Max going "Well how well do you know your sister- she had an abortion!" not even realising what he's said! Bam! All hell breaks loose
Yeah, it could happen. Then Stacey would be gunning for Max!

Actually thinking about the spoilers, it kind of makes sense. It says in the last episode, that "a guilty Max tries to avoid Stacey". Maybe that's why.