boyfriends baby momma

so my boyfriend decided 100% on his own that he wanted nothing to do with james (newborn) there has been no dna test done she's being stubborn about it. I've always told him whatever he decides to do I'll support him. he told her he didn't want to talk to her or see James. well I texted her because she wanted to try to sweet talk my boyfriend n get him to go to her house n leave me n saying he wasn't shit because he didn't wanna be there for James, when he don't even know if it's really his or not. well she wanted to argue when I texted her I was nice bout it but he said that it wasn't her fault that my man was texting her saying he wanted a family with her n that he misses her n that he knew he'd get kicked out of his home for getting back with her. I've been in a blind spot bout all this since it happened we've been together since April this happened in june. when I confronted him at first he wanted to lie about it. I told him there's no point I have the screenshots of the messages between them n he also did text her n tell her not to text back so I wouldn't find out. I was so mad....