The only person I loved died a while back; how do I get over the grief?

A couple of years ago I lost the only person I ever loved romantically, and I can not get over it completely. I never loved or liked anyone before this person. I was going to tell him how I felt about him, but he passed away suddenly, and I have been grieving over this whole thing. Crying, sad dreams, I have let myself go physically, and I am a bit more reclusive. Sometimes I can go months without even thinking about this whole ordeal, then something will remind me of that person, and I am back to grief, and it hurts so bad, I have never felt pain like this. I know this person loved me, but I at least wanted to tell him how I felt before he died - for myself, and now he is gone and I will never get that chance. Someone told me I can tell him now, in spirit, but it is not good enough. I tried talking about it with a therapist, but it only makes it worse. So I have just suppressed it, and I try not to think about it. That works for a few months, but at some point I am back to being sad, my emotions are very uncontrollable now, I was never like this before. I never loved anyone before this guy, and I don't find anyone attractive after him either, I never cared about being in a relationship or anything before him, so it cuts very deep. What do I do? Please do not say "get over it" or "move on", trust me, I've tried. Please be more specific in how I can move on if you have any advice.