Lost for Words

Well here I am posting to a bunch of strangers cause I don't know what to do. Like alot of you I thought I would never be in this situation but here I am. This morning I opened up my computer and my husband's messages were opened. Sometimes his texts on his phone come through on our computer. Anyway there is a message from my husband to a number (all I can see is the number no name) and this is the message.

My son and I were visting family the past week and haven't been home so I can't help but think something happened. I call the number and a girl picks up and I say Hi I'm such and suchs wife and basically she tells me that he invited her to sleep over on the couch at our house and he tried to sleep with her she said she felt very uncomfortable and left. She also said that he would send her messages saying "send me a picture of your beautiful face". And basically I'm here to ask how to bring this up to him he's currently at work and I plan on talking to him when he gets home. I just don't know how to handle this situation. Also just want to give this girl a shoutout for being so honest and taking the time to speak to me and above all for leaving that night. Thank you in advance.