Priorities: having children vs. being in love

my boyfriend of 3 years is certain that he never wants to have children. i really want a child and am afraid that my time is running out (i'm about to turn 29.) i love everything about him and am really happy with our relationship, but the thought of never having a child scares me. my head and my body tell me that the time is right for me. every time i have my period, i feel like i've lost something, like i'm mourning the child i didn't conceive. i don't think he will ever change his mind. his mother died when he was a baby, and he feels like he was a burden to his father. i think this is why he doesn't want a child, but he says it's because the world is too awful of a place. it doesn't seem worth it to me to break both of our hearts, gambling on a future that i can't be certain of. should i stay with him because i love him and it feels right, or break up with him because i know i want a child and i can't have that with him?