You know, you have even more to be angry about than the average LBS spouse. Its justifiable. Its normal. Its healthy to realize its your anger, to work through it. You are doing everything right.
Your H wants you as his friend because 1) it lessens his guilt and 2) he still really wants you as a friend, he misses you.
And yes, my xH has, at one point, been dating OW, and 'cheating' on her (with ME and others lol). I S S U E S
R2C asked a great question, do you still have hope for your marriage?