Ok, you asked if you should tell your g/f your wife is pregnant (congratulations btw). I don't think you've divulged enough information as to the relationship with your g/f for us to be able to answer that ?. Do you have an open relationship with her now that she knows everything that is going on in your married life?? Is she attuned to all of your daily activities such as maybe when your car goes to the garage or when you have a dentist appointment or that you went to the movies last night?? If you're open enough to share your daily life with her, then I'd most certainly tell her about your pending parenthood. If you only have a sexual relationship and don't share your daily life, then it sounds like something she doesnt' need to know. When the two of you originally hooked up, I'm sure you talked about the details of your life... yes, I'm married, no, I dont' have any kids, I like my coffee black, etc. So now that that's changing, it might be a good idea to keep her posted. I think she would be more hurt to find out after the fact if something comes up that you cant' be with her b/c of the child, then find out.
You say that your g/f is wanting you more and more. A child is going to need you more than your wife and your g/f combined. Are you prepared to take on three people that need you this much?? I just sense a problem if your g/f is wanting more and more of you. It sounds like eventually this will come to a head. That said, it's just up to you as to when you want it to end. I really dont' forsee this thing going on forever, do you?? Do you think the fact that you're going to be a parent is going to scare her off?? If so, then there's your answer.
Best of luck... it sounds messy.
