i'm dating this girl since few months but she is not my girlfriend and we don't live in the same city.
she would like to be in a serious relationship and kept saying she is always faithfull when is in a relationship.
she didn't ask to be my girlfriend but she make understand that she want this and i'm sure that if i'll ask her she will say "yes"
i'm not looking for a relationship because i love dating many girls and i don't trust girls but of course i like this girl more than the others
weeks ago we argued and we didn't talk for a week.
then we started to see each other again.
few days ago she said that in that week that we didn't talk she met a guy and she kissed then he asked her for a date but she said that she like me and she doesn't want to see him again.
knowing this hurted me even if she is allowed to do this because she is not my girlfriend
she know my reputation(i'm know as a guy that love girls and date many girls) and she is scared that i often kiss other girls in clubs etc but i never said her "yes i do that in this period".
now that she said she kissed another guy i'm plannig a thing:
i want to say her that i kissed a girl too and when she will ask me when i won't tell her if this happen before or after she said she kissed another guy.i think this will make her more gelous.
i know that confess girls that you are kissing other girls is very risky (i ruined something with other girls in the past) but in this case could work if is done with intelligence.
i can let her think....."ok i kissed another guy and he is still kissing just me"
so this is my plan....what do you guys think about?
any tips to make it better
help me this is important
thanks

OK, I'll dissect this piece by piece. And I'm running off the little info you gave me, so I'm going to assume a bunch of stuff about her, you, and you+her.

Women always say that they are faithful when they are in a relationship. That was a challenge to you, a blatant SOI, and a way to submit you to her by her getting what she wants (as most woman want that), and hinting you will get what you want in return. IT DOES NOT WORK THAT WAY

Her second challenge, after you failed to answer her in a way that she would accept ("No, that's not what I want" works, but you need to stress that), she offered it up again, this time in way of "I kissed another guy, but told him in interested in someone else...".

She may have NEVER even KISSED some other guy. She may just be playing that same card again, and if so, her next will be "im going on a date." You may not be showing congruence (integrity) with your convictions of not wanting something serious. If you are, and she's still stressing this relationship in her head, you are in for mind games later down the road (after you have sex with her).

If you think what I'm saying isn't true to your situation, i HIGHLY suggest you get kino escalated immediately and try to have sex with her. If she's going to hold out, then in her head, you've already been in the comfort zone way too long and she's going to pull that "i want to be exclusive." Don't linger here, it's the place for best friends and feeding psycho stalkers.

You can offer a little more background on the situation...