Relationship ughhh

Ok so my boyfriend that I’ve been with for 2 month accidentally called me his ex’s name But I found out at the start of the relationship he was texting her telling her he still loved her.. I’m so confused he said he was doing it because he wouldn’t let her see his kid! But when he told her it she let him now that he told her about me he hasn’t seen his kid since .. but there constantly arguing sending each other pictures of what there doing.. like to score points I feel like I’m in this relationship to make her jealous.. any ideas on what I could say to him ? Or what I should do. ?