Girls, Why do women insist on talking to guys they have been sexually involved with?

My partner has a few guys that she texts that were people she had sex or sexual acts with before we were together and acts like im not suppose to be upset that we are out for a special occasion and she is texting them while we are out but when she is out without me doesn’t respond or even read my messages and always has her phone in do not disturb mode

Girls, Why do women insist on talking to guys they have been sexually involved with?
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