A good friend of mine caught his girlfriend in bed with another man. Looking for advice.?

After 4 months of what was supposed to be a monogamous arrangement. He caught his girlfriend in bed with another man, whom he knew. She claims she was drunk but takes full responsibility for her actions. He believes this may have been going on for some time, as he found that they had a lunch date together a month... show more After 4 months of what was supposed to be a monogamous arrangement. He caught his girlfriend in bed with another man, whom he knew. She claims she was drunk but takes full responsibility for her actions. He believes this may have been going on for some time, as he found that they had a lunch date together a month prior to being caught. My friend says he loves her, but the trust is no longer there. Is there hope here. She is heartbroken over the mistake. Anyway, I told what good advice is available here, so he told me to give it a try. I know she is trying hard to reconnect this relationship, but he appears distant and suspicious.
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