Talk about your ex boyfriend
Guys do not want their girlfriends to talk or brag about their ex boy friend. This gives them a sort of insecurity and leaves them thinking if you still have feelings for your former love. They have this certain attitude to want to be better than your last boyfriend.
Have more time with other stuff
Keep yourself busy with a lot of things. Do more overtimes at work or spend a lot of time doing a hobby or furthering a cause. Spending more time with other things means having less time to spend with your guy. It would really freak him out to know that you choose to spend more time with other stuff rather than being with him.
Flirt with other guys
Try entertaining other guys or talking with other guys when you are together. This would really make him jealous and angry. It depends upon your motive, if you just want him to notice you, flirt subtly but if you're mad at him and you want him to go crazy then flirt openly leaving him unattended during your date.
Try dating other guys
If your boyfriend hurt you or worst, dumped you, care less. Try to date other guys instead and let him know that there are a lot of better guys around. If he sees you dating right away, this will make him think that you have moved on and was never hurt about what happened to the both of you.
Keep your male friends
Some guys get jealous with their girlfriend's male friends. Keep in touch with them and talk about your guy friends with your man. You will surely enjoy the look of envy on his face while hearing your stories about your guy friends.
Never be too available for him-ever
Try to refuse some of his invitations and tell him that you have other plans. Even if the invitation is so enticing, try hard to resist and make him jealous about your refusal. Keep him wondering what is it that you have planned that made you turn down a good offer.
Go out with friends
Find time with your friends and have fun and drink with them. Tell him that you will be going out with some friends and never mention to him who you are going out with. If he asks, just tell him that they are long time friends that you have not seen for a while.
