I know how it eats away at you. Being lied to for any amount of time makes you start to doubt yourself and so much of what you held to be the truth. But the way you are going about it isn't healthy for you or your marriage. You need to take what he says at face value right now and if something else is going on, it will come to surface.
I noticed that last night my H had his cell phone next to his bed again. That concerns me, especially when he was taking a shower the phone was no longer there. The first though in my mind was that he was contacting the OW again. He could very well be or he could have been charging his phone and in the morning unplugged it and put it in his briefcase so not to forget it. But I can't let this eat me up. And I can't contact the OW (as I have in the past) and ask her. That has only caused me grief in the past. So I am going to keep on keeping on and know that if something is going on again between him and the OW again, other behaviors will start to occur.
Sara
Me-31 H-38 M: 5 yrs T: 7 yrs No kids Went to Prostitutes 10-1-06 Found out about OW 12-24-07 Bomb on EA/PA: 1-2-08 OW ended it with H "for good" 3-8-08 OW is back 4-19-08 H and OW tell me that they are in love 5-19-08 Filed for divorce 6-5-08 Divorced 7-2-08