Hello Friend: I noticed this is your first post here on PC. So... welcome to PsychCentral! I hope you find PC to be of benefit.

From what you wrote, I take it this is a casual friend rather than a romantic interest. But either way, since I'm basically a recluse, needless to say how to finesse friendships is not exactly my long suit, as we used to say. My personal opinion would be there may well not be a way to address your concerns with your friend without possibly causing him to become defensive & perhaps argumentative. I doubt there's any way to know until you raise your concerns & it either happens or does not. It's the chance you may have to take if you feel this is something you need to address.

I would have to say, personally, assuming this is a casual relationship, I probably wouldn't address any of this. I would just take note of it for future reference, so to speak, & let it go. My perspective, in a situation such as you describe, would be that what my friend did or did not choose to do is his business not mine. And it's not my job, or my place, to feel as though I should try to "help" him by confronting him with what I think I know.

My inclination would be to simply accept him for the way his is, & what he does or doesn't do, unless or until such time as it becomes problematic for me at which point I would simply let him go as a friend. I personally have no interest in trying to save anyone from themselves. But then, as I mentioned above, I'm a pretty reclusive person. So I suppose my perspective on this sort of thing is skewed.

Anyway... here are links to 10 articles, from PsychCentral's archives, that hopefully may be of interest with regard to your concerns. Some of these articles relate to romantic relationships. But I would presume the suggestions they offer could easily be transferred to more casual ones:

You Can Only Change Yourself

Confronting Friends: Part 1 | Relationships in Balance

Too Much Confrontation? (Confronting Friends, Part 2) | Relationships in Balance

How to Talk to Someone Who Always Gets Defensive

In Relationships, the Worst Offense is a Good Defense

11 Hints for Resolving Relationship Irritations

The Effects of Criticism on Relationships

https://psychcentral.com/lib/defendi...al-annoyances/

https://blogs.psychcentral.com/imper...ed-boundaries/

https://psychcentral.com/blog/how-to...es-boundaries/