I think such a person is socially and mentally impaired until they are in remission. Also, look into any medications that they may be taking. I am personally familiar with lying about one's social past while mentally ill.

It's hard to really call it lying when he doesn't necessarily know what the truth is, you know what I mean? If he can't discern the truth for himself, how is he supposed to be able to tell the truth to everyone else?

Often times, people with paranoid schizophrenia will say things about family members, etc. Not to hurt the people, but because that's what they really believe. It's a sad sad condition.

If your friend has episodes that are separtated by remission, I would wait until they are in remission to clarify things. It's possible that your friend doesn't know what reality is, mentally or emotionally. They might be grabbing at straws trying to understand what reality is. If you know that they will go into remission, they will probably revert back to the person you knew.

and that look in his eyes is all the other thoughts going through his mind...he's probably lost the ability to perceive himself through other peoples eyes...

my ex fiancee says he has just been diagnosed with this illness, however at the moment i dont even know if i can trust that as since i met him our whole lives where a lie. our wedding broke up just before it was supposed to happen as he was lying to me and confused, however told everyone else he did not want this, although still says now he did he was just confused... he then had an affair and tole everyone i was a crazy stalker to cover it up.. i couldnt get the truth out of him for a very long time, he made up a house we were moving into, money, paying bills faked phone conversations etc and has now admitted these were lies, the story gets even worse even though i am now still trying to help him through. my point is if he then eventually admitted to the lies, after a long time and all be it not all of them, depending on who i want to beleive, can this have been apart of the schizophrenia, or is this a lying disorder? I still think he is lying as i am currently based in a different country to him trying to help him through, on a recent visit many things did not add up, bill paying, a lost bag with my present in,my missing car keys, a flat tire that has since not gone down, etc etc and everyone surrounding this knew nothing about it, he says they are lying. so im a very confused person who has seriously been put through the mill by this, i just dont know where i should stand and how related this could be to the illness as i cant seem to trust him at all but he will never admit to these new lies, or cover ups that do not make sense.

Lying and Schizophrenia are two opposite extremes.

The regular folk are the liars and thus constantly deceive themselves as well due to being constantly at a vast distance from the truth.

http://www.wired.com/wiredscience/2009/04/ schizoillusion/

As in the case of the above example, the regular folk are self deceived by the picture of the “hollow mask”.

However, the so called " Schizophrenic " sees the truth instead, thus this more advanced mind does see the truth, and a less advanced mind will say that he who does see the truth must therefore have a defective mind, since a proper perfect mind must always be deceived.

it also seems to me that his condition sems to fit identically with bipolar instead. he doesnt tick all the schizophrenic boxes and seems to explain more the lying... however eventually he has since admitted two lies i knew about and this surely means it is not the illness but a plain deception or he would not have realised he was lying. Anyone have any opinion on this?

I have a son who has schizophrenia and lies to me, his father, and steals from me .

The lies are not a necessary part of the illness i.e. they all do itwith the condition . It is more likely related to the time at when the illness arrived, and the current 'what is going on'.
Arrival in adolescence brings with it adolescent behaviour, and lying I think is in that context. Schizophrenia seems to stop maturity at the ime it happens. There is also some faultline in putting current experience into memory and holding on to what is going on now, so as to build it in to what was the store of previous values and standards. Failure to stop may be part of that.

all that said challenge to the behaviour is accepted if pushed, but still the behaviour will return until the life has settled into a better supported position
I accept the beaviour because it is part ofadolescent v. father behaviour..

doesn't stop me shouting however but that's natural and soon gone
Nagging is different and unsettling.move on somehow.