Trying to save the relationship with the mother of your child is very important.
I was in the same situation of near losing my wife a while back, but then I read three tips about saving relationships on the internet.
I thought why not try them, they could help.
And you know, I was so happy I gave it a shot, because they helped me to turn my relationship around! Wondering how powerful these tips could be? See for yourself:

• Think about when your relationship started.
  How are things different now than they were in the beginning? For example, maybe you have stopped taking your wife out on dates every Friday night.
  You've got to maintain some personal time for the two of you.
  And do not blame yourself, with children, I understand how difficult it can be at times to find any time for just the two of you.
  You can't use this as an excuse though, just make a strong effort to get some alone time.
  It'll make a huge difference!
• Next, I want you to think about how often you see your friends.
  Also, this can be hard with children at times too, but seeing your friends will help keep your relationship with your wife strong.
  You need a balance of social activity in your life, and just the kids and your wife is not enough.
  Try and find some time where you can just mess around with the guys.
  You'll find this to relieve a lot of stress and keep your relationship strong.
  
• This last one is very important, and happens to a lot of couples, especially on the guys part.
  How often do you look her in the eyes and tell her you love her? I mean really tell her? Probably not a lot.
  If you can remember to tell her this everyday, you will be in good shape!