cheating

I recently caught my husband texting and messaging with other women sexually whben I confronted him he said that he's never touched any of them so it's not cheating just entertaining. I disagree. one of the messages was from his baby momma she messaged him last night saying she was horny and wanted his dick he's cheated on me before with her but he claims he didn't go but he didn't tell her no wither or even tell her not to speak to him that way I just feel so betrayed and disrespected. I want to leave but we have a one mointh old and I don't want her aroujnd any hoes when I do leave..