Should I tell her?

My kids father and I had something in the first month he was with his now wife. I came clean, she got mad but forgave and now we get along well. Before we started getting along she asked me to tell her if he suggested anything sexual to me because now with a baby she doesn't want to deal with him if he is trying to cheat. And well he started asking me to be his friend with benefits today and I said no. Should I tell her? I want to tell her but I don't want it change her relationship with my kid's because they love her or her involvement with them. I don't want her to go away 😭

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