He's talking to her again.. what should I do?

After My partner got another female pregnant on me, I find out THIS MORNING HE HAD INVITED THE SAME WOMAN OVER AGAIN. not only that, I drive to see him. HE WENT TO PICK HER UP. In the text i read from her "I can't even be mad at you. It's not like we are together anyway. You are who u are. I will just find someone better". Like WHAT? Im in a whole relationship with him and he's STILL obviously sleeping with her. He goes out of his way picking her up when he lives 5 blocks from her. WHY can't SHE WALK THERE😤. Plus like i said this is the SAME WOMAN who slept with his BLOOD COUSIN. The cousin as i heard; still wants to sleep with her while she"s pregnant with MY MANS BABY. he told me he Laughed about sleeping with her and everything. Yet, im the one being laughed at when im the one who's been around for the longest. At this point, im losing my mind over this. I really do want to hurt this girl. But my man don't want me fighting her because she's supposedly is Pregnant with God knows WHO BABY. im over it. What should i do now? I left from his house 4 hrs ago and i blocked his number since he WON'T leave her trifling self alone. . 😤
He's talking to her again.. what should I do?
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