Do men get jealous when other men have better women?

I suspect... one guy is jealous of my boyfriend , because he has me...
That like liked our common friends, he asked her out, he always made sexcual comments about her
She rejected him
She was 16 years younger than him
Im 10 younger than my boyfriend
Besides that guy is still married
Can he be frustarted that he couldnt get with her as my boyfriend did with me?
He acts like a dick towards him
Do men get jealous when other men have better women?
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