To answer your question, yes, it is "possible to get over someone." That's not to say that you won't always feel a bit sad/hurt. I suggest you talk to a counselor about your situation, since your feelings have been damaging your life so much.

I know it sounds callous to say "there are other fish in the sea," but there is some truth to that. I know because I have had strong attachments to other people since then and even realized that that relationship had its drawbacks.

I suspect the other person has gotten on with life. Moving on can take some time, but it can be done. Okay?