Navigating sensitive kid issues

Hello everyone. I am not sure who else I can talk to about this right now bc it feels insensitive so I’m coming here for advice.

I’m in a relatively new relationship that has moved very very quickly. He has a young teen who lives at home with him. We’ve met – I thought we got along swimmingly. We hang out and laugh together when I’m there or we are out together. Recently though his child is exhibiting some very scary things. Refusing to go to school. Hurting themself. I can’t help but think – bc of the timing of this – it could perhaps be a cry for attention from dad because he and I are spending so much time together so quickly. This has been rolling around in my mind these past few weeks but something really serious and scary happened at school today and now I think he and I need to have this conversation. I really care about him but I think his focus needs to be elsewhere right now. I don’t want to kick him while he’s down or make this about me but as a m or her myself – I need to make some tough decisions here I think. How should I brooch this? What would you all do? How would you handle?

Thanks for reading.