If he was separated when you met I'm a monkey's uncle.
He's lining up to try his BS on the ex but she is older and wiser than you, so I doubt she's going to fall for it.
But she must have been younger than you when she was traded in for a teenager. You need to get your ducks in a row as Mumsnet usually advise. If the ex doesn't bite, I would be zero percent surprised if he isn't out fishing for your replacement by spring.
Protect yourself and your son, financially and practically.
Govt announces Ukrainian style scheme to bring thousands more migrants to UK


