My girlfriend doesn’t want kids what do I do?

Thank you for this question.

Ideally, couples will have this conversation well before getting married. I recommend having a real heart to heart about each other's wants and goals and aspirations and continuing this discussion over time as the relationship moves on. Whether to have children or not is a deal breaker is still yet to be determined between you both. As is the idea that perhaps one or the other will change their mind when it comes to having or not to be having children. And the hope that one will change one's mind once one sees other friends and families having families could simply be a fool's errand. 

As for the deal breakers of having or not having children deeply depends on how dead set each is on having a family or not having a family. If your partner is dead set on not having children then there really is not much you can do to try and change that course, and accidentally getting pregnant along the way might end up having a whole new set of complicated conversations. 

However, the mere notion that you are thinking of leaving the relationship with someone whom you get along well with and the families get along well with does indicate that parenthood is something extremely important to you. Your partner is being very honest with you about their feelings about having children, and life with them would pretty much remain the same as it is now.

Very few couples start out with exactly the same vision of the future, it is an ongoing negotiation of give and take, as long as the compromise is not one-sided. Negotiation should strive to nurture the relationship and each other's personal self-growth. We should want each other to be happy, and not fit into the other's way of life and give up your dream of having children. 

You can spend time searching your heart about how important children are to you and the life that you want.  And also be very honest about how a child-free future would be to you. Are you living the life that you want or are you living a life for someone else? is it possible that resentment might slip in and be a part of the time you share moving forward?