You are in love with some one and at the same time enjoying sex with other woman, strange! Love is a feeling where you can not think of any body else in your life, not even for sexual pleasure. Your friend loves her but he is not in love with her. I hope you can understand the difference. From your brief narration about his past, It seems that he needs analytical work up by psychiatrist. Confidentiality is a part of psychiatrist’s profession, so it is not a constraint.