My wife is pregnant with another man's child

I'm so sorry you had to go through with this. I think it's best for the both of you if you get a divorce. I think the man should take full responsibility because the child is his, not yours to bring up. You shouldn't feel like you need to as well -- it's solely your wife's unfortunate decision that brought upon this mess so you should find a way to leave to prevent yourself from getting hurt over and over again. You deserve so much better. If you're feeling depressed, seek professional help: therapy, counselling. You should always remind yourself that there will always be a silver lining behind every dark cloud. Don't give up!