Yeah I've spoken to her and told her how I feel about the messages. She showed me the message herself as it was sent at 7am in the morning when we'd just woke up.

She assured me that she'd not messaged the guy and then deleted the text and blocked his number. I told her that it puts me on edge and I dread the next time a message might be sent to her. I also proposed that she changed her number but she said she would not do that.

I'm still worrying about it now but all I can do is accept her word I guess.