Do not bug her for answers, bcoz if she wants to tell you she would have done so. Pressing her for answers will only irritate her and detest.
Pay her back with her own coin. She wanna go out with guys? You go out with gals...but only for casual meals only. No clubbing...if not wat diff am I from her? Dun volunteer information before hand on such outing. Answer on demand only. Let her know what its like to know only when she probe, then will she knows whats its feel like not being informed before hand when your partner is going out with the opposite gender. She screams at you? Ask her why you were not informed of her last outing with her male fd...and tell her its the same reasons. BUT STRONGLY ADVISED TO USE THIS METHOD ONLY ONCE.
Talks to gals on the phone quietly. Cut the conversation when she probes. There's nothing actually going on with the conversation...mainly work or look for another fd's number or email. Just to get her suspicion, which will naturally arise when she loves you.
Spent quality time with her like courtship days...then make this outings good only on certains days and work late on the rest of the days and no outings at all. She will treasure the good times together and keep herself free and look forward to the next outing with you.
I learn all this from a gal, who is often piss off by her man, telling me how to get back at your woman...
