Guys, What does a guy exactly mean when he jokingly says he's jealous of my boyfriend?

Chocochip_cookies
So, this guy and I know each other for a long period of time, we aren't super close or anything but we're really good friends. So we were school buddies and now go to the same college as well, so once we were talking and he randomly asked if I found any guy at college, to which I replied I found one outside of it and he said he was very jealous laughingly. Now what's funny is even he had a girlfriend at that time. He broke up with her after a while and a few days after that I too broke up with my boyfriend though he still doesn't know about it. What confuses me more is he used to text a lot before he got to know about my boyfriend but after that, he is kinda a bit withdrawn or something, we still have good conversations but it doesn't seem like before... what's up with him?
Guys, What does a guy exactly mean when he jokingly says he's jealous of my boyfriend?
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