Is he jealous that I was on my phone?

I was hanging out with a guy I have been seeing for months. We were talking and hanging out when all of a sudden I had checked my phone to see if I had any messages. The guy started acting weird. He was ignoring me when I was talking to him. So I just left his house. I also noticed when I am in my phone he’s always looking over to see what I am doing. Is he jealous because I was on my phone?
Is he jealous that I was on my phone?
Post Opinion