2. I go to an HIV support group and there's one member I see regularly on hookup apps, but on his profiles he lists himself as HIV- negative and on PrEP. Our group is confidential but it feels weird to not say anything.
If he's at a support group, it's probably because he needs some help. Instead of calling his bluff, try drawing from your own experiences to prompt a discussion about HIV disclosure on the dating scene. Dating with a secret like HIV can be devastating. That's a great reason to disclose, but it could help for him to talk about his reasons not to. Make an effort to help him on his journey and you just might grow a little yourself.