Pregnant again...need advice please?

well i had been seeing ths guy for a month now he was stayn wit his famly he came frm out of town.as time passd we decided to hve sex. we usd a condom but he decided to take it off and he didnt pull out when i told him to multiple times. he told me how he thught he was infertile n how he had been wantn a baby. i told him tht i wasnt ready for anthr baby i already hve a child.so he decided to go bak home and i find out tht he is bak with his ex girlfriend.and i discovr i am pregnant. he told me tht they werent togthr wen he was down there wit me and tht he doesnt knw wat we shud do abt the baby.im startn to get really depressd becuz i feel like he did ths on purpose and now im stuck wit ths decision. he isnt bein a jerk or anythng but all ths weight is on me and i dont knw wat to do.i just cant picture havn two young children alone.any advice