So basically, my friend group consists of 3 girls (including me) and 1 guy. He and one of my girl friends started dating about 3 years ago but broke up 2 months ago. My guy friend then kept talking about another crush that he had even during the relationship, so I pressed him about it, and he told me that it was my other girl friend. Apparently, since we had met in elementary school, he had a minor crush on her in 6th and 7th grade. He thought it was nothing, and when we were in 11th grade, he got feelings for the girl he dated, so he confessed and thus the relationship. But then his feelings for the other girl came back, and after struggling for so long, he ended the relationship. The other girl absolutely sees him as a brother. What should he do in this situation?