I found a second phone

Context: We broke up but we still live together and have a baby. I thought we could maybe patch things up but he scoffed at me and that was it. Now I found this second phone creep up, which I knew he had from the days we did of and he would use it to talk to men but through the idea of being with me. So I don't know if he is still using me and photos or if he is just on the dirty chats and scrolls people's dirty videos getting off from them. I'm upset because he always seems to hide things about his phone or "phone's" I broke up with him because he was disrespectful and toxic....but it stings and hurts me still that he doesn't even try