I doubt there is a single answer to this.
It could be control. It is an amazing way to control the emotions of a man, or perhaps two men. It could be the endorphine response resultant from a sexual act, but honestly I suspect that is less significant.
It could be from doubts about the intentions and fidelity of the new guy.
It could be just the devious and nasty way she was brought up. Maybe she needs to grow up and move beyond using sex as a weapon.
It could be really primal hormones telling her "propagate your genes".
It could be a desire to be victimized by two different uncaring and uncommitted men as a form of self-loathing or self-punishment.
Each person has to be in charge of their own behavior and self-control and emotional response.
old feelings
Best is not to have anything to do with him, once a cheat always a cheat.
Answer his question woman.
NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO....did I meation NO!!
"He is your ex boyfriend" is correct.If you were to say "he was your ex boyfriend" it would suggest that he is no longer your ex.
Cheat on him and flaunt it public, . Or woman up and dump him yourself.
If its strong emotions then YES . .^
NO WAY!!!!! that's sooo wrong
Only if they're an unfaithful slut. It's wring to cheat on the person you love, and if you don't love them, you shouldn't be with them.
Tell you boyfriend you are a one man woman and you don't share! It is wrong for your boyfriend to want to date you and another woman. He lacks commitment. If he continues on with this then show him the door as he may just cheat on you.
i mean, if he's your ex-boyfriend he's your EX-boyfriend. that means...boyfriend.
You have the control over whether you should go back to your ex boyfriend or stay with the young man that loves you (you must love you present boyfriend or you would hopefully not be with him.) Many ex boyfriends have not treated their ex girlfriends with the respect they deserve or, the ex boyfriend may have difficulties committing to one girlfriend and may cheat or the two constantly argue and they end up breaking up. Once the young woman moves on and falls in love with another young man then many ex boyfriends want what they can't have (they cannot stand the thought of their ex girlfriend having a new boyfriend and it is out of possession of her; jealousy and generally not about love) and complicates her life by telling her he loves her. You have to think back to why you broke up with your ex boyfriend and decide if he really is worth having a relationship with. Be very careful because if you break up with your present boyfriend to go back to your ex boyfriend you may well have lost a great guy in your present boyfriend.