I recommend you read up on narcissism.. 
It got to the point with my GX ., still to this day..if their lips are moving they are lying. I think it helps them sleep at night.

Dear MomofFour:
 He's not "wayward."  He didn't wander off the garden path; he made the deliberate decision to cheat and to deceive. 
  And yes, I think that when discovered and confronted the GID/closeted spouse is so desperate they'll say--and promise--just about anything.  They are that desperate to believe they aren't gay or to remain in their closets.  I would never have believed my stbx could act the way he has, and say such contradictory things, if I hadn't seen and heard it for myself.  If you need to say something to your children that will account for both the truth and for his lies, telling them that their father is having to confront an aspect of himself that he wishes he could disown and is so desperate that he's not in his right mind and is lying.  
    And don't get your hopes up that after he talks to a professional he's going to come to his senses.  He's going to do and say anything to stay in his closet.  Please don't deceive yourself, either; he's never going to "straighten up" and fly right.

OMG....My GID soon to be x tells so many lies I think he is delusional. I was truly questioning my own sanity. At times he would convince me he didn't say what he had previously admitted to.....it got to the point I had to write things down he confessed to but eventually he would claim he never said them. He has so many stories he can't keep them straight. All these years, 44 years, I thought I had the bad memory or I misunderstood where he said he was going (he travels overnight weekly). After I discovered TGT 9 months ago, he has my head spinning, "I am bicurious, I am bisexual, I was just experimenting, I thought I was gay but I am not gay, I only had sex with one man, then I was raped by 3-4 men," then he picked his only one sexual encounter with a man  at a bar.......

He has just worn me out, I am exhausted, I no longer care what the hell he thinks he is or what the hell he does......I want out. My divorce will be final January 10th, I am just remaining on good terms with him because he is being fair about the finances. So I am bidding my time, being smart , no more confrontations.

I am trying to avoid the anger and bitterness, at 64 years old, I don't have time for it. I am hoping for happiness and peace. My soon to be GIDX still lives in the house.....every time I look at him I see a gay man. I am told it gets better with time, I hope so.
 

Answering a little late but I do believe my GID believes he is not really gay. He says and I believe he really thinks it's just a curiosity and that it only represents 1% of his sexuality. Joining a hookup site to find someone to have sex with on the down low is not a 1% thing. Risking bringing home God knows what to your wife is not a 1% thing, but he is still swearing that it is.  Yesterday he asked me what he could do to help and I said "Go back in time and not marry me" and he told me that I am "his whole world" and honestly, I believe he really thinks that. I don't think it's a narcissism thing in him...he's just so confused and terrified to be who he really is that he's convinced himself he's not gay. I lived with a narcissist for 2 1/2 years before finally leaving and meeting my husband.  My GID husband is NOTHING like this guy. But I do believe I was attracted to my husband because he didn't demand the things from me that my ex boyfriend did...I saw it was a wonderful thing...until now. Now I see what was really happening. Hind sight is truly 20/20. 
 
I envy you that your divorce will be final soon. I haven't even started the process yet and it's SO overwhelming to me.