My fiance has an ex girlbest friend?

Ok so my fiance and I talked about his former female best friend.

He told me they met back in 2022 when he was In a rehab program and when he was getting ready to leave he asked when he finished if he could have her number she agreed but he forgot.

They went on two dates but they never labeled it anything between them.

They had sex twice.

She was still his friend when he was with his ex who is now in jail.

She lived with him and another guy friend in his apartment because she supposedly didn't have anywhere to go. But my question is he for real when he said that he will stop being friends with her because im not comfortable but will they be sneaking behind my back I trust him but her I so do not trust also she works at my job and he will be coming back to the job in a couple of months.

Also she called him and me both a hoe and im not one.

My fiance has an ex girlbest friend?
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