I spent 8 years in a relationship because I had gotten preganant. It did no one a favour - especially the two children than were the product of the relationship. I did everything to be the woman he wanted me to me and make the relationship work. Unfortunately it was plainly obvious he neither loved me nor wanted to be with me. The resentment grew until the point he himself gave up and grew increasingly hateful and eventually quite emotionally absuive.

Do NOT allow your life or those of your girlfriend and child to degenerate into that. You owe it to her and the coming baby to give them a chance for stability and the potential for (another) love in their life.

I agree that the best decision is support this little family from afar and break off the relationship.