Weird relationship with my baby daddy

So we aren’t together anymore. We have 2 babies. 1 is 3 years old and the other is 1 years old . He basically cheated on me so i will not be in no. Relationship with him we are just talking still and he comes over my apartment to see the kids but he tries to do stuff with me thinking we together but i dont want too. I see nothing with him he makes me gross and sick to my stomach he cheated! So once a cheated on me u lost my respect. But i am too nice to let him come and hangout with us. But why does he do this to me? He always wants to sleep with me and do stuff but i say no because he didnt want a relationship he wanted to be single so ur losss. But he is giving me money so i guess u can say i am using him for $. Because i dont wanna go through the child support court process… please help do u think i am in the wrong for him to come over and see the kids and give me $ even tho we aren’t together? Then he tries to bring me and the kids over to his house with his family but i dont want to because hes tricking them to thinking we are together. One happy family !!!! When we arent i have hatred over him and disgust. I only have a good heart so he can see his kids … what do i do