@Carol6408
Welcome to ABB CC from across the miles of lands and oceans from New Zealand
Perhaps they are struggling to try to cope with day to day living and have been overwhelmed with all the bombardment of what we are world-wide being subjected to.
Sometimes people either need a little Quiet space, or maybe they are not sure how to address things.
The reality is, none of us know what is going on an anyone else's lives at any given time.
Sometimes it's good to ask, 'Are you Ok?'
Or 'feel free to talk about something that may be on your mind'.
Did you open the doors to communication and offer a cup of something to drink?
Maybe they were shy or introverted, nervous or not sure what they were getting themselves into or have lost a loved one.
Maybe send the guest a message and offer to invite them around for a cuppa next time they are in the area so they know a door is open for them.
There's an enormous number of people suffering in silence with Mental well-being issues world-wide, sad to say.
It's great you have reached out here in CC as it shows you are a caring person to be concerned with another Human Beings well being.
All the best