Having Hard Time w/ Breakup

I was with my only long term boyfriend (3.5 years) and we broke up in May. We lived together for almost 2.5 years of that. Everyone thought we would get back together, but we didn’t. He actually has a new recent gf.

I was diagnosed with ADHD in August and was diagnosed with anxiety I think like 1.5 years ago?

No matter what I do I can’t seem to get over him and be able to start dating again. When we broke up I moved back in with my parents and he moved in with his uncle. I went to therapy, which actually led to my ADHD diagnosis and made me realize a lot of areas I went wrong in the relationship. I picked up new hobbies including Pilates 3-4x a week, painting, and reading. I started trying to do more things with friends. I tried to go on dating apps and start trying to date again but I just can’t get into it. But I also miss having a loving partner.

Not sure if the attachment and letting go is an ADHD thing or not, or anything that you have tried that helps get over an ex. I can’t let go of the thought either that his current relationship is just “cuffing season” and it’ll end and I’ll have another chance to show him how much I’ve changed.