You should be ashamed that you place your worthless little pecker before your daughter.
Get your priorities straight. You're a father now. Save the marriage if it can be saved. That means buckling down, working with your wife, seeking external help if necessary, making compromises etc, etc. If all else fails, evaluate the situation and determine what's best for the life you chose to bring into this world. And I can promise you running off and having an affair with a married woman is not what's best.
Grow up you selfish idiot.
God, so atrocious in the Old Testament, so attractive in the New--the Jekyl and Hyde of sacred romance.
-Mark Twain
If people are good only because they fear punishment and hope for reward, then we are a sorry lot indeed.
-Albert Einstein