Funny...I dun think u are brownie6222 right? That was meant for
brownie6222 and not you. 
"So she has to lie about something she does not want anyone to know
lah, correct? So are you saying she has to be respected when she
tell lies? Duh."
I mean respect her if she dun want to tell. If she lies, then ask
yourself why she did that. Coz she dun want to let you know? If she
die die dun want to let you know and you force her for an answer,
most probably she will lie, isn't it? So who is not respecting who?
She has the right not to tell.
"What if the lie is: she is married with two kids and the spare
tyre, er, I mean new boyfriend has no clue about it? Should she be
respected in this sense?"
I would say she kept it from you and not lie to you. You get
it?
Would you not respect a person because of her past? I dun think
it's a shame to be a single mum. If the guy cannot accept it, then
that's his problem coz it's a fact that she is a single mum. It's
up to him to accept it or not.
You really contradict yourself. If you mean married with kids but
got a bf, and that makes the bf a third party, then that's
extra-marital affair. Then she is at fault. But if u mean she is a
single mum with kids, probably not married before or due to a
divorce , then that's a different story. Did she lie? she merely
kept it from you. If you found out the truth and confront her, yet
she said that the kids are her newphews or whatever relatives, then
can she be counted as lying.