I'm sorry that you lost a loved one in that way.
I don't think that people do just get over grief I think it is always there but it changes over time. The acuteness of loss, grief and aloneness will change. Elizabeth Kuber Ross wrote a book about the grief cycle that people go through as they grieve a loss not everyone goes through all the stages but she mentions things like anger, despair, crying and disbelief, bargaining and acceptance. Perhaps you experience some of these or perhaps you will in the future. I think that its time for you to be kind to you as you can. Be patient with yourself no one expects you to just get over it. But remember your loved one couldn't have anyone more appropriate to be with them than you and was probably comforted by your presence. The love you both shared you'll take with you and will not be forgotten as you will remember him.
take care.