Need help making girlfriend jealous?

Take your girlfriend out to dinner and sit on a table that is next to an attractive woman. A woman who's attractiveness would make your girlfriend question her value to you. Every few minutes shot a quick side glace to her until your girlfriend notices and deny everything

dont play games with your girfriend, its never ends good.

Break up with her. Obviously, if you break up with her, it must be because you're interested in someone else. And if she doesn't get the hint, that's good, because if you truly love somebody, you shouldn't want to make them jealous in the first place. So end the relationship regardless of whether she feels jealous or not; it's obvious that it's not a healthy relationship.

Buy a bra and leave it somewhere in apartment so she thinks it's someone else's of yours.

Grow up

Wear a girls pants and bra and parade about her house then explain that these clothing belong to another girl.

Go and touch men's butthole so she will be mad that she ain't getting any man butthole

Buy 20 pounds of lipstick.