What would you do?

Hey ladies, recently I found in my husbands phone a picture of a naked girl. He said that it's a picture from the Internet and he used it to masturbate that night. I also found a conversation he had with his girl friend, telling her that he couldn't wait to hear her voice, etc. when I confronted him he said that his friend was going through really hard times and just wanted to cheer her up. This a good friend of his, but it still made me upset to know rant he was talking to her in that way. I'm trying to forget about all this, but it always comes back thinking am I not enough that he had to find a picture to masturbate. What would you ladies do?