You are already a married man. As a married man you need to learn to have more patience and control your temper in order to improve your marriage life. You need to have more responsibility. When things go wrong, it makes you feel angry, frustrated and to some degree you cannot control your emotion and temper. Later you will find yourself feeling sad and guilty. Always think about your loved one and the feeling of guilt before you act.
Your wife is a good lady and she is suffering too. You love your wife, instead of hurting each other, why not work something out toward a better union and for your baby sake. The bad times will pass and when you look back, you will find yourself silly. Never think of separation or divorce else you will definitely regret and you will not have another good marriage. When you are about to make the wrong bad moves, at least you still have your good wife to pull you back.
Cheers.