Can men be insecure and jealous because of look?

There is a man in my class that is hitting on me. I rejected him, and I told that to my boyfriend. So he planned to meet him in front of me, to make it clear. So I was waiting with this guy, and when my boyfriend saw him on our table he was very shocked, and he wasn’t even able to talk directly, and he didn’t said anything when this guy tried to flirt with me again! When we were alone, my boyfriend asked me if i found this guy handsome. It’s true that he is better looking than my boyfriend, tall, muscular, Greek god jawlines, and he also work as a model, and my boyfriend is very skinny, and average looking, but I love him, and it’s surprise me to see him, asking me a thousand times, If I’m sure I will never leave him for this guy, because he know I’m not blind. Of course I just cuddled him, and had sex with him, to comfort him, but it surprise me that he was intimidated by friend’s look. Is it normal?
Can men be insecure and jealous because of look?
Can men be insecure and jealous because of look?
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