uh...............i think coming in the house PERIOD is crossing the line..she's the ex end of story, she needs to drop the kid(s) off and leave, nothing more.
i'd be furious, my husband does not have any conversations with his ex without me there, she does not come into our house he doesnt' come into her's i don't go in my exhusbands house and he doesn't come into mine.
i agree with denise, think long and hard if you guys progress in the relationship...........it royally sux to have to put up with "the ex"...it may be good now, but when push comes to shove over who the "queen" is, it's not fun..............
my ex husband used to do this to get away from HIS crazy wife (still having issues with his wife, but he's not hanging around)..my husband was ok with it, but i was not...my husband was even asking for his help on some outside work and well i just was not brought up that way.
if you're uncomfortable with it talk to your man..i totally think it's crossing the line, but how do YOU feel?