My gf and I have been together for going on two years now. The entire time I have been very honest with the fact that I do not want to have kids. Nothing against them, I love them, and I'm actually very good with them but I just have never wanted kids for myself. For the first year my gf has been ok with this but in May my sister had a baby boy and since then, she has really made it known that she does want to have kids and she really wants to have kids with me. For a brief time, I considered it, but ultimately stood by my no kids choice. I didn't want her to have any false expectations that 5 years down the road, I will want to have kids, and then be mad at me when I don't. I understand that she wants to be a mother very badly and I think she would be a great one, but I just don't want to have kids. Usually when the conversation comes up, it always does, it ends with her saying that she would rather give up being a mother than being with me, which makes me feel incredibly guilty because even though I love her and want to be with her, I do not want her to give up something so important as being a mother just to stay with me. I feel like she would spend the rest of our relationship resenting me because she could've been a mother. I don't really know what to tell her anymore. This will probably end up breaking us up but I don't know what else to do. She wants them and I don't and I don't think children are something that someone should have unless they really want to have them, and I don't think someone who really wants to have them should have to give them up.