Is it normal to feel feelings of longing & associate sexual arousal only with your first sexual partner after breakup?

My ex was almost 15 years older than me and I met him during undergrad. He was the first man I ever saw naked, was naked in front of and or did anything more than kiss. We broke up this year and I'm not seeing anyone else. I also don't have any plans to.

He slept with a sex worker a few months after our breakup and I wondered if it was because he'd had sex before so it was easy for him to do something intimate like that with someone else. He said it was he just wanted a body and that it was unfulfilling because he missed what he had with me & sex with the sex worker was all business and not intimate. That he was with a sex worker ruined any chance of reconciliation for me. He is a csa survivor & it disgusted me that he did that.

I have no interest in being with anyone else sexually and feel it impossible to even have the desire for it because it took me so long to share that part of myself with my ex. Is this normal?

I would like these feelings to go away as they are preventing me from moving on.

Any advice would be greatly appreciated. How long did it take you to move on emotionally from your first intimate partner?