how can i fix this?

Hi, excuse the mistypes as I'm using a tablet. My wife just told ne that she has been in an emotional relationship with another man via texting. She told me this last night. She said today that she is not happy and hasn't been for a while. That she was not intending to go this route but it just happened because of her unhappiness. I believe I still have time to fix this but i need some advice. Backstory I was 23 when I met my wife and she was 18. I had a party house and she was a partyer. We hit it off and within a week or so she was staying at my house every night. Our main thing we did together was drink. Every night we'd get drunk and have sex. Within 2 weeks of this we started dating. We seemed to be a great couple. A decent amount of interests, both of us are kind compassionate ppl, and we would get along so great. A year into our relationship she got pregnent. My viewpoint was I'm pissed, but I'm in my twenties, I love this girl so might as well start a family. We didn't talk this out but I just kinds assumed she felt the same way since there was never any talk about "what should we do". At this point I was a lowlife. Living with my mother and no job. The baby quickly changed that. Fastfoward 2½ years. I have a career now and support my family monetarily. We just got married last month. I'm a nice guy and would never physically or (intentionally) emotionally hurt my wife or child. But I have a drinking problem and I know that it does just that. I don't get drunk and hit her or say mean things to her, I'm a very happy drunk. I think that's why its taken me so long and been so hard for me to see that sobriety is what I need. Also there have never been any repercussions to my drinking other than the occassional hangover and money I spend. My buddy has a brother that just got out of prison a couple weeks ago. My wife has been texting him just to be nice, I'm guessing she was feeling sorry for him. Being fresh out, not knowing anybody, things like that. They have been texting for almost two weeks and have had a couple of face to face encounters around me. She told me last night that she has started to like him. She says that she is not happy with our relationship and hasn't been since she got pregnent. That is why she is able to start feeling for the other guy is what I'm guessing. She told me she feels bad about having this emotional affair and she stopped texting him three days ago. she says she is most unhappy with my drinking and our financial situation(bad economy, we can pay the bills but that's it). She said she wants to be with me and wants to be happy with me but things need to change. I told her and I will stop drinking. But I need some advice on how I can fix what ive messed up. How can I make it up to her and show her that I love her. Basically how do I be a better husband to her?

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