Give up! Once a liar, always a liar. Since you've discovered your partner is a pathological liar, there is really nothing you can do to maintain a relationship with him. Eventually he will screw you over so badly that you may as well just end it now.
Mystery Man
Harsh, but true.
Very, very true. Listen to MM in this case.
If you're one of those chicks that like psychopaths (which, I highly doubt you are) then yeah..but seriously...this is kind of random and liar isn't really on the same level as him, but I was watching this documentary on the night stalker (a serial killer who broke into family's homes, brutally raped and killed like 13 women, worships the devil, draws pentagrams on his hand and is completely nuts) and he had groupies! women sent him (and still do, as he's awaiting death row) love letters! REALLY?! REALLY. It is like...you don't have to have low standards lady, but this shit is ridiculous. He is a piece of shit. beyond all hope and reason. The moral of the story is....be smart, don't pine for douche bags.
So True! Also, you need to constantly assess whether he is telling the truth or not. Some (or most) guys are very good liars, and they can deceive you with their...appearance of sincerity. I know guys use the excuse that they are trying to protect you when they lie, but the truth is, they're cowards. It's ok to differentiate between a fib and lie, but know that if they can lie to you now, they can lie about bigger issues in the future, like cheating.
Well, For sure let him go. Maybe it will be a learning lesson for him and one day will get his act together. Seems like he has a bit of growing up to do though. There is no need to "wait" around for someone to change though. 3 years of my life are gone because of that, NEVER settle.