Why is my ex calling me at night?

My ex and I broke up a month ago because he cheated but still stayed in contact for like a week. We haven’t spoken in weeks and he hasn’t called me. He works night shift. Last night I was woken by my phone ringing around 12pm and a what’s up text. We work the same job and I looked at the schedule for today and saw he worked last night which means he called me while he was at work. I can’t call him back or text because there’s something up with his phone that won’t let me call or text him but he’s able to text and call me.

Updates
1 y
12am sorry
Why is my ex calling me at night?
Post Opinion