Tony was working in his suit for the 13th time and you started to get a bit enough of it, He was your Husband and he couldn't even Stop Making those Suits in his free time instead of spending some quality time with you.

And he was working again..But he also tried to make the arc reactor's better but his mind was on his damn suits and it was getting annoying by that.

So you got really enough, You hid the blue print in somewhere that he couldn't reach just acted like nothing happened.