Is it normal to be jealous of the guy my girlfriend used to like?

For starters, my girlfriend and I are both 21. We were bestfriends for about four years till we fell In love. We got closer when I was shoulder for her to lean on I fell in love. She did too but didn’t realise it until very late. While we were still bestfriends, she used to like this guy she was acquainted with. According to her, he was so gorgeous she couldn’t believe someone like that could exist. She was strangely intimidated by him. I get extremely jealous when I thjnk about them meeting or hanging out again and don’t know if it’s normal.

Is it normal to be jealous of the guy my girlfriend used to like?
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