Why would this guy who started seeing few women recently gets jealous when I’m talking to our common single male friends?

Anonymous
He and I had feelings for each other. We never dated because of his complicated relationship. He recently turned single and showed interest but never asked me out. Something happened recently and I started staying away which he thought that I’m avoiding him. I asked our common female friend to spy for me and he told her that he got on dating app and seeing other women and told her he doesn’t see me as his girlfriend.
But he gets jealous if I talk to our common male single friends.
he and I work together and I never get calls at work but a day before Valentine’s Day i did and I saw him very surprised (he turned his head the moment I said hello on the phone) and started looking at me when I was walking out of office space to take the call. I’m confused by his behaviour. Can someone help me understand?
Why would this guy who started seeing few women recently gets jealous when I’m talking to our common single male friends?
1 Opinion