How can you tell when you've gotten a guy jealous?

He makes sarcastic remarks or gives you "looks". Especially happens when your talking or near the person hes jealous of.

he gets moody, irritated or snappy, because he is jealous. guys usually only get jealous if there is another guy in the picture since guys are so territorial over their girls. i mean i guess he could be jealous in other ways, like jealous over your success or whatever. but mostly guys show it by having a poor attitude.

hmmmm..... well guys show it in different ways. some guys get all clingy and don't let anyone else look at you or they suck up to you. others will let you kno clearly they are jealous by wanting to like fight another dude who glances at you. guys are different..

He doesn't like to see you with any male then himself, he doesn't allow you to hang out or visit any male friends!

He starts paying you a lot more attention!

wen the guy doesnt act like he cares and wen he is mad

you told him that your Ex was way better in bed than he ever will be.