(23F)Thinking about sex almost 24/7. I am tired.

Edit: don’t text me in private if u are trying to find someone to fuck!!!
For a year I (F23) have been single. I tried to date or just have casual sex, but it didnt’t work out.
I still have feelings for my ex and with him I had the best sex ever, meeting eachother fetishes. We fucked for some times after we broke up (still amazing sex) but he did moved on and I won’t ruin anything. I respect others relationships.
Still, I realised recently how much he fucked me up in the head (lying, manipulating etc) and I can’t seem to be able to let anyone too close to me. I can’t believed I let myself be so stupid and believe every lie he fed me… Since then, it’s been hard to let anyone pleasure me.
As I said, I tried to date or to have casual sex, but it just doesn’t feel the same.
I feel I am going crazy. I feel I will never be able to feel comfortable with someone else next to me again.
I am thinking about the sex we had 24/7 and I am really tired. I don’t want to think about him anymore, it hurts phisically. It’s not healthy. It’s toxic.
I am using toys everyday but, as we know, it’s not the same.
I miss the human touch, the interaction, the feeling that someone cares.
I feel pathetic and hopeless for being horny this much. I am studying, working and working on some hobbies, so I am always busy. Still, even this doesn’t help. I might write a long ass essay and still find myself lost in a fantasy.
I really don’t know what to do. I am tired and drained.
If someone has any advice on how to cope with this, please help.
Thanks!