Oh.kk well me and my boy friend are in love but he got another girl preganant wat do i do?

he asked me to get a girlfriend i said OK i went t atlanta and when i came back she was talk in bout she pregnant i told him not to have sex with her but she lied and told him i made her promise me that they would have sex he believed her the only reason i'm mad is because she lied to me and told me she wasn't pregnant but she was man what should i do