I did something unforgiven but I don't regret it, Do I?

Me and my boyfriend (both 21) had a big argument and he said "You should know your place as a woman" so of course me being me left immediately and went out to clear my head but a little problem accrued that caused me to meet his infamous (very famous in the campus) ex-girlfriend who is hot as fuck... we talked and talked and talked and then we had sex... I don't even feel bad and that's what makes it worse
I did something unforgiven but I don't regret it, Do I?
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