My friend’s break up, how should I handle him and her?

So I went out with this girl for a week, then she broke up with me because she wasn’t ready (Understandable) a few months later, my best friend asks her out, and they start dating, she loves him he loves her, they have the perfect relationship, the perfect relationship I always wanted, but, anyway, so they go out for a few months (6). My friend got diagnosed with severe depression about 3 months into the relationship, it only got worse from there. Recently it got really bad, and he couldn’t handle the stress of everything, and he told her he needed just a bit of space and was going to go offline off of everything. The next morning she sends him a message that started with, “I know you broke up with me… He didn’t intend to break up with her, he might be the first person I know of who ACCIDENTALLY broke up with their girlfriend. He then said that maybe it’s a good thing and just went with it. She on the other hand did not take it well at all. I called him up everyday, to hear how he’s doing, and the same answer as always’
“You know it’s not going all that great” so then, the next day at school, the Monday, I talked with his ex, I asked her how she was taking it, she said not well, it was the first day she wasn’t crying since the break up. The next day, she didn’t show up to school, so that night I asked her how she was doing and if she’s ok. Now, my worry is that she might think I’m going for her because she’s single now, and the other worry is that my friend think I’m going for his ex a few days after they broke up, when I genuinely only care for how they are doing, so what am I supposed to do now?