How to stop this past relationship from haunting my life?

Hello, I broke up with my first love years ago. It's been like 3 years. We no longer talk and see each other. Matter of fact he told me face to face he will never love me again. GREAT! So I know me and him will never be but I can't stop thinking about him, he's on my mind every day, and even though I'm thinking about smtg else I have a feeling he's stil on m mind. I dream about him at least once a week. It's becoming very overwhelming. I feel annoyed by the fact that I can't help msyself. I know he has nothing to do with me anymore and I want to move on seriously but how when I smell his odor, every song reminds me of him, I think about him on a daily basis and dream about him very very often...they said with time, I'll be fine. Oh well it's been 3 years and even though I've been in other relationships, it was still the same bullcrap..anyone has been or is in same situation? And how to get cured? Should I go see a psychologist or anyone who might help? This is very overhelming. Thank you for your help and please be nice people! Thank you