Should i believe my babys father and take him back or leave him completly?

Well to begin with i agreed, probably in desperation at the time, but i agreed for him to marry this e.u woman for his stay. but then i recently found out, by snooping in his fone that he had got her pregnant!!! i confronted him about this striaght away and we argued for days, because i was so hurt by the fact that it was hard enough for me to come to terms with the fact that he was marrying another *****, but the fact he got her pregnant as well jus tore my heart out. i imediately went to leave him and he begged me and BEGGED me to stop and was telling me all this about how he loved me and his daughter which by the way isnt even 1 yet. he stop us leaving around 4 times claiming that he f**ked up really bad and his sorry would i please giv him another chance. he cried and cried and he offered to stay in his car outside the house for a couple of nights,but i told him that i didnt care if he even went and slept in a gutter. he claimed he never meant to hurt me an dats y he neva told me.