To be supportive or not...

I don't want to be a "bad friend". But I am emotionally drained. My FWB, turned bestie/business partner, is going through a break up. I told him I don't want details bc last time he accused me of prying after I asked a question after telling me about their issues. Not fair. Apparently baby daddy is causing issues.

Anyway, he doesn't show emotions to me but says he showed them to her. He wants to tell me over and over "he's in a bad mood and wants to be alone" but I can't ask why or if he's ok. We run his business together. It's hard to just walk away. I dealt with my own personal feelings for him. Where was he or anyone when I was at rock bottom with my emotions and anxiety? So am I a bad friend if I don't seem supportive? Should I just sit back and listen or just get rid of the friendship altogether? I would feel horrible though.