<human>: Can you summarize the given text in a few sentences?

Full disclosure: Her and I are no longer together, she is currently in an official relationship with the other man only 2 weeks after we broke up. While we were together the "other man" situation was a constant source of anxiety and feelings of inadequacy for me and lead to constant fights and ultimately our break up. It's a bit more complicated than that though because the other man was one of my absolute closest friends. She says that I'm needlessly throwing away my friendship with him because they "did nothing physical" while we were together and therefore he's still a "good friend". I don't have many friends so it's a huge loss. Am I right in feeling they cheated on me together which is unforgivable or am I over reacting and he's still a good friend who I should reconcile with?
<bot>: gf and best friend had an emotional relationship while we were together, she thinks I should remain friends with him because he never was physical with her.