>>3 I agree
If they're your friends you can only ask what's wrong but if they choose to walk away and not say anything to you there's nothing you can do. They're the ones with the issue not you. You're just a caring person to ask and even go this far to get help. We can't help when something so obvious someone avoiding you no one push themselves on them. They'll come back if they notice you're concern but don't take my word for it to b/c they sometimes don't.