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Ok first of all, we can't assume that she is cheating on him, or is going to cheat on him.
It is common practice for people to try and intentionally get their mate to be jealous in an attempt to remind them that they are desirable (if other men want her, then he should want her too). Since he cheated on her, she probably feels the need to re-assert this notion, aka why she is making him jealous by talking to her ex.
With this being said however, he has made her feel unwanted by cheating on her, and likely destroyed her trust in him and confidence in the relationship. Conversely, her attempt to remind him that she is desired is making him paranoid (possibly with good reason,) and thus making him distrust her. At the end of the day, when the trust is gone, I would argue that the relationship is pretty much ruined, unless you two work REALLY hard on re-building the trust. My guess is that you are young and if this is the case, you probably wont bother to work on actually fixing the relationship.
Conclusion? Break up with her. Your relationship is likely headed in that direction anyway.
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