Anyone have any advice please on partner obsessing with past? 33m and 27 f

We’ve been together a year and a half. My partner will bring up my past saying how it was dirty, trampy and a slag - for simply sleeping with 9 guys. He has slept with way more people than me including a prostitute and 7 girls in one week (way before me) I’m sick of him

Thinking it’s okay to see me as that. Sick of the double standards and just don’t know what to do about it. He says that women are harder to sleep with and are a challenge, yet how come he’s slept with way more than me? Not just by a few but hell of a lot. Just tired of going over the past.

I was in an abusive relationship before my now bf and I do genuinely think I’m suffering with ptsd etc lots of other things and I just can’t control my emotions at all when it comes to arguing. I vent to my best friend about arguments we have and he doesn’t like this, but it’s all I’m used too.