Help!! Need advice pronto!!

Okay so me and my boyfriend have decided to take a month break and he told me to see other guys during that time. Before we broke it off we had unprotected sex during my fertile window... we use the pull out method which hasn't caused any trouble for the last 11 months... But today I decided to have sex (not during my fertile window) with another guy (like my bf asked). We used a condom... And he says it broke, but he didn't cum in me. What's the possiblity of one of them getting me pregnant and if I am pregnant how do I tell which one of them is the father... I really do feel like a slut and know that a lot of people might judge but I really need advice not criticism please.