I don’t know what to do.

last night was a rough night for me. My SO and I have been ttc for two years now. He has a daughter from a previous relationship that I take care of when she’s not with her mother. I’m more of an emotional person and ttc has been a hard journey for me emotionally. In the beginning my SO has been so supportive but up to now he has not. Last night was my breaking point. After a long argument he snapped at me with the why do YOU need a kid so bad. I have a daughter be happy with that. I feel like a horrible person for saying this but for me it’s not the same. I am not her mom. And being a mom was something I dreamed about for a long time. I just don’t know what to do anymore and I’m heartbroken with this now. I feel as if I’m wasting his time when he can find someone who will give him another kid so easily and I feel like he doesn’t understand the pain that I’m going through daily with not being able to have my own but having to care for another’s when they do t care. I hate this so much.