What Would You Make of This

Just for a bit of background I have a daughter who I'm not having a good relationship at the moment and an ex from many years ago who was trying to get me to go and see him although he knew I was married. That was 3 years ago. I blocked him on FB and only had a couple of emails since asking if I was ok but I didn't reply.
This morning I had a text out of the blue asking - Don't give me the silent treatment. I replied to it asking who it was.
I don't recognise the number and it's not my daughter's no. The phone was promptly switched off because it's only been read this afternoon. Not had any replies.
It's bothering me and my mind is not in a good place at the moment. Lot's of problems with DH at the moment not abusive or financial but a bit too much to go into at the minute.