AD, I don't know if this helps right now or not, but, being a sex addict has very little to do with sex.
It is a result of a woman feeling that her value or worth comes from her sexuality or appearance. Her "drug" is the attention, being desired, the chase, all of that, not the actual act. She probably feels tremendously guilty immediately after. She probably feels a lot of shame, all the time. She probably wonders why she can't stop it. But, the brain chemicals that are released when she's in that mode, are as powerful as heroin.
She will probably repeat the same pattern over & over until she addresses her self worth & self esteem issues.
I know you're angry at her right now, & you have every right to be. I just wanted to share this information with you. It's like asking a drug addict to just stop cold turkey. If she manages to stop on her own, she'll go through incredible withdrawals, once those brain chemicals are not surging. She may back slide. She needs professional help. If she wants to come back to you, at some point, I'd insist she get some therapy before you let her back into your arms & your heart.
just my 2 cents. Take care. There are people here who care about you & Abby.
M 19 years, MC for 8 months, DB'd for 8 months 4 kids; 18, 15, 14, & 10 I was never meant to be a doormat. It took me years of therapy to become assertive enough to stop his abuse.