this is not a good position for this child to be in either. its only going to get worse
the confusion you have is only going to lead to lies,cheating,etc
would you want this child to have to go through this in the long run? no
you wouldnt want him to grow up knowing daddy lied and cheated on mommy. whatever happens either strive to fix this relationship or end it.
for the sake of this kid.
if you really want to try and make it work go to marriage classes. dig deep. why did you love this woman in the first place? why are you with her in the first place? what sparked things in the begining? maybe theres a way ton rekindle that...
if not then you need to let go and get out.
does your wife know how you feel?