Marriage

So I caught my husband texting another woman but ever since I confronted him he said he has stopped texting her and calling her and it’s been like a month and a half now but Out if now where this woman since a message telling him he has no shame and showing off how much he is deeply in love with his wife that he lied to her and telling her that she was important so then I confronted him about the message and he said I haven’t talk to her in more than a month I don’t know why she Will send this message so now I don’t know what to do should I call her and confront her and find out the truth or should I just believe him please give me some advice