Did his ex's tell you THEY cheated on him or did he tell you that? Sounds like this man has a history of cheating one way or another. I mentoned to someon else in another similar post that:
WE ARE TREATED THE WAY WE ALLOW SOMEONE TO TREAT US, ACT LIKE A DOOR MAT AND THEY'LL CONTINUE TO WALK ALL OVER YOU.....

Your situation reminds me of my own, my ex also acted like he worshipped the ground I steped on and I was Queen in his eyes, it was all an act but since he has no computer at home its dirty magazines etc. he spends his time with. I tried for many years to look the other way because he except for his porn, treated me so well. But sooner or later you realize its all bull and if he really did love and respect you there would be NO need for a counselor or endless discussions of his wrong doings. Wake up, walk away and live, love and be happy elsewhere but make sure you get what you deserve, don't cut yourself short and instead of feeling sad about losing this lying, cheating jerk, think of the humiliation and hurt hes caused you and know he'll do the same thing to the next unsuspecting female he come across. They NEVER change!!!