no dave - i think mandy pretended to be ians girldfriend to throw the family off the scent of him being gay.
Marching On Together “Ross: First divorce, wife's hidden sexuality...not my fault. Second divorce, said the wrong name at the alter...kinda my fault. Third divorce, they shouldn't let you married when you're that drunk and have stuff written all over your face...Nevada's fault.
Smallwille, Shane doesn't know that Ian's gay, Jamie doesn't care.
I don't get why you think this is something 'wrong' in the show.
As far as the Maguires are aware; four years ago Ian and Mandy were together for a while, Lip and Mandy shagged behind Ian's back, Ian and Lip had a fight in the Jockey, Lip and Mandy got together. None of them know that Ian's gay (except Mickey) so they have no reason to believe that Ian and Mandy's relationship was fake. Lip and Mandy have since split up so it's all water under the bridge, they're hardly going to sit around talking about "oh do you remember when Ian and Mandy were together for a few weeks?" or feel the need to tell Jamie about it when he got out of prison.
"so, whats been happening while i've been in prison for the last ten years?"
"Oh, the usual Maguire drug dealing and criminal activity. By the way, Ian was thought to be the father of Mandy's baby but it turned out Lip, Ian's brother had slipped Mandy one behind his back and the baby turned out to be Lip's"
As for Jamie not caring if Ian's gay, what does that have to do with whether he found out the real reason Ian and Mandy broke up?
I have watched seasons 1, 2 and 3 in full so I'm not guessing.
Strictly, its nothing the show has done wrong, just i find it a bit unrealitic how its all been forgotten about.
It's still old news though and wouldn't warrant anything more than a minor conversation when Jamie first got out. It's only the gay thing that would elevate it to plot-level importance and the Maguires as a unit don't know about that side of it.
My point being that it hasn't necessarily been forgotten about, it's just not important enough to bring up ever.
Theres a house missing, now the maguires house is end as it was a middle house lol also in other series the front of the houses is all covered from grass and trees as series 5 theres pavements and houses in front, wow lol