Advice for dating

So awhile ago me and my boyfriend broke up. It was probably about two years ago. I’ve dated other people since, I’m sure he has too. I had a boyfriend I dated only for a month, after that. We broke up because I still had feelings for my ex.

I don’t understand. I have not seen nor talked to my ex, but I feel like I am never going to care about someone again the way I felt about him. And knowing that, it wouldn’t be fair for me to date anyone else. I’ve dated other people and I still don’t feel like I can care about anyone the way I did for him. I’ve given myself ample time, I’ve seen other people, I have not talked or seen my ex, I’ve moved forward in life, I don’t know what’s wrong with me. I’m at the point where I’m fine being single forever just because I’m okay and happy alone. But if I start dating, I’m going to compare someone new to my ex and that’s not fair. I don’t feel like this is something I can get over, and I’m don’t know what to do. I don’t think I’ve ever admitted this before for two years and I’m scared this isn’t ever going to go away. It doesn’t feel like a moving on issue because I’ve already done that.